Russia’s Rubicon drone unit, which is sent to hunt Ukrainian drone pilots, was not used to being hunted itself, Brigadier General Andrii Biletskyi told journalists on 19 October. He was summing up Operation Vivaldi, which his Third Army Corps fought in northern Donetsk Oblast from May to mid-October. Once its pilots realized they were being killed, Rubicon’s morale dropped sharply, he said.

Russia has fought for 12 years to take all of Donetsk Oblast, and Sloviansk and Kramatorsk anchor the fortress belt of cities Ukraine still holds there. Vivaldi retook 277 km² in northern Donetsk Oblast. Biletskyi says it destroyed Russia’s bridgehead on the Chornyi Zherebets River and forced Moscow to drop its plan to bypass Lyman from the north and encircle the two cities. On that front, the Third Corps had flagged Rubicon, Russia’s elite drone unit, as a threat.

Hunting the hunters

Once a Rubicon position was found, the Third Assault Brigade and the KRAKEN drone regiment committed any number of FPV and bomber drones to destroy its crews, Biletskyi said.

The brigade’s commander, Yaroslav Levenets, said his troops prepared for Rubicon’s arrival and concentrated on killing its pilots. He gave no details.

“Not stable in defense,” Levenets said of Rubicon’s troops.

They dislike sitting in trenches, he said, and under pressure they grow nervous and change positions.

Named for four seasons

Biletskyi said the name was chosen at the very start of planning, in winter 2025–2026, many months before the operation began. The original plan had four stages, one for each season, and later grew to slightly more, ArmyInform reported.

When he first unveiled the operation in September, he put it this way:

“Vivaldi, as is known, has four seasons. And this is only the first one.”

He credited two planners, known by the call signs Yurist and Leshyi. Leshyi, an assault soldier wounded seven times who later moved to staff work, was killed. Yurist was seriously wounded.

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A new hand at the Third Corps

Major Dmytro Rohoziuk is now acting commander of the Third Army Corps, the corps press service said on 20 October. The press service said the move is not a transfer, and Biletskyi keeps his formal post as corps commander while he leads the “Center” grouping of the Third, 11th, and 19th corps.

Rohoziuk took over the 60th Mechanized Brigade in October 2025. Its previous commander was arrested in January after the State Bureau of Investigation accused him of embezzling about $1 million in weapons procurement. The brigade fought in all four phases of Vivaldi and retook Kolodiazi without street fighting.

Biletskyi also declined command of the Ground Forces, which oversee mobilization.

“There’s no point taking on something you don’t truly believe you can improve,” he said.

Biletskyi’s count

Russian losses in Vivaldi topped 8,000 troops, and about 270 Russian soldiers were taken prisoner, Biletskyi said. More than 20 officers surrendered, including a chief of staff and three company commanders.

The territory matters less than disrupting Russia’s strategic plan, he said. Russian forces still press toward Dobropillia, where Ukraine is counterattacking.

Ukrainian forces have liberated more territory since the beginning of the fall than Russian troops have captured during the same period. This trend has persisted throughout 2026, Ukrainian President Volodymyr Zelenskyy said in his 18 October address. He also reported that Dobropillia, Kostiantynivka, and five other settlements remain under Ukrainian control.

Russia systematically exaggerates its battlefield gains. A recent briefing by Valery Gerasimov, chief of the General Staff of the Russian Armed Forces, in which he claimed that Russian forces had captured 92 settlements since the beginning of September, as well as Kostiantynivka and Dobropillia, and advanced to within 5 kilometers of Zaporizhzhia, was based on “outright lies, manipulation, and exaggerations,” Ukrainian General Staff spokesperson Andrii Kovaliov said.

Ukraine also continues to defend areas near Kramatorsk, Zelenskyy said. He dismissed Russian claims about Zaporizhzhia.

“We are destroying Russians 20 kilometers from Zaporizhzhia, not five, as someone in Russia is fantasizing to Putin,” Zelenskyy said.

Ukrainian forces continue to hold back Russian assaults and destroy groups of occupying troops attempting to infiltrate Dobropillia, the president said. The Defense Forces are also defending positions elsewhere in Donetsk Oblast and in Kharkiv and Zaporizhzhia oblasts.

Zaporizhzhia axis: Russians seek to move artillery closer to the city

Russia seeks to advance on the Zaporizhzhia axis to bring the regional capital within range of its tube artillery, hold forward positions, and protect rear areas from Ukrainian strikes, the Institute for the Study of War (ISW) said on 18 October.

Maksym Kravchuk, spokesperson for Ukraine's Southern Group of Forces, refuted Gerasimov’s claims that Russian forces had captured Malokaterynivka, located south of Zaporizhzhia, stressing that the settlement remains under Ukrainian control, the Center for Countering Disinformation said on 18 October. Ukrainian troops recorded a video directly from Malokaterynivka to confirm this.

As of 18 October, Russian forces had advanced or infiltrated to within 24 kilometers of Zaporizhzhia, ISW said.

Dobropillia remains under Ukrainian control despite Russian assaults

Dobropillia is now a fortress anchoring Ukrainian positions along the highway leading northeast toward Kramatorsk. Russia first tried to take Dobropillia in August 2025 and is now trying again.

Russia is redeploying reinforcements to the Dobropillia axis and continues to send assault infantry through the village of Nove Shakhove despite heavy losses. Russian command will likely try to encircle or at least envelop Dobropillia and cut off Ukrainian supply routes from the direction of Bilozerske, Ukrainian military analyst Kostiantyn Mashovets wrote on 9 October.

Mashovets sees the push as the southern flank of a Russian effort to envelop the whole Sloviansk–Kramatorsk urban area.

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Dobropillia remains under Ukrainian control, Zelenskyy said. On 18 October, footage located by analysts showed a Russian soldier hoisting a flag in the town's southeast after an infiltration, yet ISW has found no sign that Russian troops have dug in there.

Russia claimed to have captured Kostiantynivka, but ISW found no evidence

Ukrainian troops in and around Kostiantynivka are stopping Russia from locking in its gains in the city or pushing on toward Druzhkivka and Kramatorsk, ISW said on 17 October.

Russian officials claimed that capturing Kostiantynivka was an important step toward establishing control over the Sloviansk–Druzhkivka–Kramatorsk urban agglomeration and the entire Donetsk Oblast, ISW said in August. The Kremlin also claimed that Russian forces had captured the city as early as 5 July, the institute added.

A Russian military blogger claimed that Russian forces had full control over Kostiantynivka, but ISW found no evidence to support this claim, the institute said in its 16 October assessment. Russian troops had only infiltrated parts of southern and central Kostiantynivka without consolidating positions, and there was no evidence of their presence in its northern part, ISW added.

Ukraine’s Security Service (SBU) detained two men suspected of scouting targets for Russian strikes on Sloviansk and Dnipro, the agency reported on 14 October. Catching both early let it secure Ukrainian reserve command posts and the gas stations the alleged agents had been hunting, the agency added.

Sloviansk anchors the northern end of the Fortress Belt, the chain of fortified cities that has held Ukraine’s defense of Donetsk Oblast since 2014. Russia is pushing to seize them, and its aircraft bombed a residential area of Sloviansk on 11 October. Where Ukrainian convoys stop and troops gather is exactly what Russian handlers allegedly asked these suspects to supply.

A gas station worker suspected of filming convoys

The first suspect worked at a gas station complex in Sloviansk, Donetsk Oblast. Russian intelligence allegedly reached him through a former classmate who left for Russia after the full-scale invasion and now works for its special services, the SBU said. He then allegedly used his phone to secretly film Ukrainian army convoys at or near gas stations. He was allegedly supposed to send the photos and videos to Russia to help it prepare a targeted strike. He also allegedly drove his own car around other gas stations and bridges that the Defense Forces use for logistics.

Spotted through Telegram comments

The second suspect, a former Pokrovsk resident, moved to Dnipro in 2024 and settled in a dormitory. Russian intelligence noticed him through pro-Kremlin comments he posted in Telegram chats, investigators say. A female handler in Russia allegedly tasked him with guiding missile and drone attacks on places in the city where Ukrainian troops and equipment were concentrated. He allegedly scouted on foot or took public transport to reach outlying districts.

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Officers seized computers and smartphones containing evidence of the men’s alleged work for Russia. Both are suspected of treason under martial law and of unauthorized dissemination of information on Ukrainian troop movements or deployment, under Articles 111(2) and 114-2(2) of the Criminal Code. They remain in custody without bail and face up to life imprisonment with confiscation of property. The SBU’s office for Donetsk and Luhansk oblasts ran the operation under the Donetsk Oblast Prosecutor’s Office.

The Russians are pouring troops into a key sector just southeast of the town of Dobropillia in eastern Ukraine's Donetsk Oblast, threatening to overwhelm Ukrainian defenses and march one settlement closer to Kramatorsk and Sloviansk, the last two big free cities in Donetsk.

But the Russians' push toward Dobropillia isn't without cost. Russian losses in this sector are "colossal," according to the mapper Playfra. And every soldier the Kremlin deploys along the Dobropillia axis is a soldier it can't deploy elsewhere.

And that may help explain why the Russians are falling back in two other key sectors, in northern Donetsk Oblast and in neighboring Dnipropetrovsk Oblast. The Dobropillia axis is the Russians' clear priority. For the Ukrainians, that's an opportunity to attack elsewhere.

Dobropillia, a former mining town with a pre-war population of around 28,000, is now a fortress. It anchors Ukrainian positions along the highway that threads northeast to Kramatorsk.

Russia has attacked here before. In August 2025, Russian troops pushed a salient toward the Dobropillia–Kramatorsk highway, and Ukrainian counterattacks cut it apart. By October that year, President Volodymyr Zelensky put Russian losses on the Dobropillia front at about 13,000.

Ukrainian military analyst Kostiantyn Mashovets describes the push on Dobropillia as the southern flank of a Russian operation to envelop the whole Sloviansk–Kramatorsk urban area. The other approaches are harder going. From the southeast, the Russians are blocked by stubborn Ukrainian forces still clinging to positions in the ruins of Kostiantynivka. From the north, starting this spring, the Ukrainian 3rd Army Corps rolled back 18 months of Russian gains.

For an army that's been struggling to complete its conquest of Donetsk, to say nothing of breaking through in other front-line oblasts, Dobropillia has become the priority.

And that's why the Russians are channeling fresh forces into the Dobropillia sector. Part of the 41st Combined Arms Army and units of its 90th Guards Tank Division are now fighting there, Mashovets wrote on 9 October, and the Russian command keeps feeding fresh assault infantry into the sector through the village of Nove Shakhove despite heavy losses. The open-source account Unit Observer tracked the buildup as early as September.

Potentially tens of thousands of troops from those formations join the main forces of the 2nd and 51st Combined Arms Armies, according to Mashovets, as well as elements of the Russian naval infantry, facing the Ukrainian 1st Azov Corps and 19th Army Corps around Dobropillia.

The reinforcements give Russian commanders more options. Mashovets expects the 51st CAA to push south and southwest of Dobropillia and the 2nd CAA toward Raksha and Sviatohorivka, enveloping the town and cutting its supply routes from Bilozerske before any direct assault. The neighboring 8th CAA is fighting around Kostiantynivka. The Russians' immediate goal is "to maintain this offensive pressure from summer into the fall," Unit Observer wrote, setting conditions for a possible siege of Kramatorsk next year.

The outlook for the Ukrainian defenders of Dobropillia is "worsening," Playfra warned on 13 October:

The Ukrainians aren't without options, Playfra explained. They should double down on their current strategy of saturating the fields around Dobropillia with drones in a ring at least 2 to 3 km deep, forestalling large-scale Russian movements until the winter strips the leaves off the trees, depriving the Russians of their best cover from overhead surveillance. This could buy Dobropillia "much more time," Playfra predicted.

Mashovets puts a date on how long Dobropillia has to hold. If it and Druzhkivka, the town just south of Kramatorsk, hold until mid-to-late December, he wrote, the whole Russian plan for Sloviansk and Kramatorsk would collapse and have to be rewritten almost from scratch.

Help isn't coming

Just don't expect a lot of Ukrainian reinforcements along the Dobropillia axis. Many of Ukraine's best troops are busy attacking.

Taking advantage of the surge of Russian manpower in the direction of Dobropillia, Ukrainian forces have counterattacked where the Russians are weakest: in northern Donetsk Oblast and also in Dnipropetrovsk Oblast, just south of Donetsk.

In months of carefully planned assaults supported by ground robots and intensive drone strikes, Ukrainian forces have liberated hundreds of square kilometers in northern Donetsk and Dnipropetrovsk. The Ukrainian 3rd Army Corps' Operation Vivaldi in northern Donetsk largely removed the immediate northern threat to Sloviansk and neighboring Kramatorsk.

But it didn't do anything to help in the direction of Dobropillia, where the Russians have many more troops, much more firepower, and—equally importantly—a singular focus: closing the southern jaw around the last big free cities in Donetsk.

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Ukraine has completed its Operation Vivaldi, aimed at protecting its fortress belt cities of Donetsk Oblast, which helped Kyiv preserve the region from Russian occupation for 12 years. Brigadier General Andrii Biletskyi, the commander of the Third Army Corps behind the operation, has reported that the fourth phase secured 101 km² of territory. Among the latest achievements is the liberation of three settlements—Zelena Dolyna, Lypove, and Kolodiazi.

The operation's main objective was to move Ukrainian troops into more advantageous defensive positions, Biletskyi said in the first days after the operation was made public. Vivaldi has now summed up the results of all four phases: Ukraine has established full control over 16 settlements, liberated 277 km² of territory, and inflicted 8,000 casualties on Russian forces.

Ukraine worked against Russia's deadline

During Operation Vivaldi, Ukrainian forces have prevented Russian troops from outflanking the Sloviansk-Kramatorsk agglomeration and cutting the Kharkiv–Sloviansk highway, a key supply route for Ukraine’s forces in Donbas, Biletskyi says.

“We thwarted the offensive of the Zapad grouping and forced it to redeploy some units of the 1st Tank Army, which eased pressure on Kupiansk-Vuzlovyi,” Biletskyi announces.

Previously, the Institute for the Study of War noted that Russian President Vladimir Putin was confident that Russian forces would be able to seize the entire Donetsk Oblast by the end of 2026 — the Kremlin’s latest deadline for achieving this goal.

Ukraine’s military was on a mission to prevent this.

Season one: clearing russian infiltration groups

On 15 September 2026, Ukraine’s Third Army Corps announced Operation Vivaldi in northern Donetsk Oblast. During the first phase, Ukrainian troops cleared Russian groups from 75 km² of territory and liberated another 10 km².

The Third Army Corps said it had struck Russian supply routes and fuel infrastructure, prompting Russia to relocate its fuel and lubricant reserves to Voronezh Oblast. According to the corps, Russian forces lost around 1,500 troops, more than 12,000 drones, and hundreds of pieces of equipment.

Season two: liberation of Shandryholove and Derylove

On 20 September, the Third Army Corps reported the liberation of Shandryholove and Derylove and the establishment of full control over Drobysheve.

During the second season, Russian forces lost another 800 troops, bringing their total losses across the first two seasons to more than 3,000, according to the corps.

During the first two seasons of the operation, Ukrainian troops and attached units regained control of 125 km² of territory, including 50 km² that had been fully liberated.

The first phase of Vivaldi involved eliminating Russian groups that had infiltrated Ukrainian positions, explained the commander of a battalion in the 125th Brigade, callsign Darwin, per ArmyInform. After clearing those groups, the Defense Forces moved on to the operation’s second phase, using reconnaissance drones to detect Russian forces, he added.

For this, Ukraine used UAVs and ground robotic systems.

“The Third Army Corps was the first in the world to begin deploying ground robotic systems by air. Our heavy bombers deliver kamikaze ground robotic systems more than 10 kilometers behind enemy lines,” Biletskyi noted.

Season three: advances near Novе and Ridkodub

On 28 September, the Third Army Corps reported the liberation of Nove, Ridkodub, and Katerynivka and the restoration of control over Karpivka and Novomykhailivka. Ukrainian forces regained another 51 km² of territory, bringing the total area liberated since the start of the offensive to 176 km². Russian forces lost around 2,000 troops, and more than 250 were taken prisoner, the corps said in its summary of the operation’s third phase.

“The Russians were convinced that the main axis of attack was Shandryholove–Zelena Dolyna. This led it to squander its reserves in counterattacks along that very axis. The Russians slept through the actual strike, which was focused on capturing Nove,” Biletskyi said.

Operation Vivaldi aimed to disrupt Russia’s plans in Donetsk Oblast

The need for Operation Vivaldi arose amid Russian attempts to encircle Ukraine’s fortified belt in Donetsk Oblast. Ukrainian forces conducted preparatory efforts aimed at degrading Russia’s offensive capabilities, including strikes on Russian drone operators, the Institute for the Study of War reported on 9 October.

Ukrainian counterattacks in the Lyman direction and east of Sloviansk and Kramatorsk were intended to complicate Russian efforts to seize the fortified belt in Donetsk Oblast, the report noted.

The corps advanced gradually, reclaiming small areas instead of attempting a large-scale breakthrough.

A Russian attack on Sloviansk on 13 October wounded members of a Ukrainian Red Cross team, the Ukrainian Red Cross Society reported. The same day, a Russian bomb hit the city’s invincibility point, one of the state-run hubs where residents warm up and charge phones when power goes out.

Help is getting harder to reach in Sloviansk. Public transport stopped after a Russian strike on two buses in nearby Kramatorsk killed 30 people on 8 October. From 1 November, a curfew from 16:00 to 11:00 will cover nearly all of Donetsk Oblast’s free territory. The people providing help are hit too. Russian drones struck three ambulances in Kramatorsk on 5 October. In August, a Russian strike destroyed a World Health Organization humanitarian warehouse in Dnipro.

Team had moved from Lyman

Three members of the society’s Lyman city branch were hurt. The branch had moved to Sloviansk because of the security situation and kept working there. All three were hospitalized with shrapnel wounds and burns. The building where the team worked took heavy damage, and a fire caused by the attack damaged the organization’s property.

The society’s Donetsk Oblast branch later added that a fourth person suffered a concussion, and that all four were hospitalized. The Red Cross condemned attacks on civilian infrastructure and humanitarian workers.

Bomb hit the warming center

The strike came at 12:45 in the Lisnyi microdistrict, Sloviansk city military administration head Vadym Liakh wrote. He later identified the weapon as a FAB-250, a 250-kg air-dropped bomb. Eight people were injured, and five apartment blocks were damaged, Liakh said. He described the warming center’s building as damaged, while Suspilne Donbas reported it destroyed.

Two Russian strikes on Sloviansk that day killed at least one person, Donetsk Oblast head Vadym Filashkin wrote. Liakh said a Russian attack on the Semenivka neighborhood killed a 55-year-old woman. On 14 October, Filashkin reported that Russian attacks killed three people across Donetsk Oblast on 13 October, in Sloviansk, Druzhkivka, and Starovarvarivka.

Russian drones hit Ukraine's power grid, warehouses, a food warehouse, a home-improvement store, and a farm overnight on 9 October, Ukrainian officials and emergency services reported. The strikes triggered emergency power cuts in Kyiv and other regions and killed at least three people across the country.

As Russia continues its daily terror attacks, it has likely begun its winter strike campaign early, aiming to make civilian life in Ukraine unbearable, ISW assessed. Those strikes now reach beyond the grid to the businesses that store and sell goods, adding to damage Ukraine's Economy Ministry expects to reach up to $10 billion this year.

Power cut in Kyiv and other regions

Russia launched 136 drones overnight, 93 of them jet-powered, Ukraine's Air Force said. Air defenses downed or suppressed 114. Drones hit eight locations, and debris fell at seven more.

DTEK, Ukraine's largest private energy company, introduced emergency power cuts on Kyiv's right bank and in the Bucha and Vyshhorod districts on the grid operator's orders. Ukrenergo, the national grid operator, imposed emergency outages in some regions, citing the strain Russian attacks put on the system. Planned schedules were suspended there. Hourly cuts across parts of Ukraine had already been set for the whole day.

The cuts came a day after a Russian strike knocked out several grid elements supplying Kyiv, leaving many consumers without power. Russia has sharply stepped up attacks on Ukraine's energy system in recent weeks, deliberately targeting power lines and transformers, Ukraine's Energy Ministry said.

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Warehouses and a store

In the Bucha district of Kyiv Oblast, Russia hit warehouses and injured three people, Ukraine's State Emergency Service said. One was hospitalized. Rescuers were searching for a woman who may be under the rubble.

In Odesa, a strike damaged the roof of a warehouse storing food and started a fire, the region's emergency service reported. In the south of the oblast, Russia damaged buildings at holiday resorts and destroyed a café.

Near Chernihiv, Russia hit a site just outside the city after 03:00, the city council said. A Suspilne correspondent at the scene reported that a drone hit the Epicenter store, part of a large Ukrainian home-improvement chain. Russian forces also struck a farm in the Kulykivka community. No one was hurt in Chernihiv Oblast.

Russia has already destroyed more than two-fifths of Ukraine's modern warehouse space.

Three killed overnight

In Zaporizhzhia, Russia struck near an apartment building, killing a man, the Zaporizhzhia Oblast administration said. The number of injured rose to nine, including a 14-year-old girl, regional prosecutors said. One strike landed near an after-school education center.

In Ivano-Frankivsk, falling drone debris started a fire, and a man born in 1959 was killed, Ivano-Frankivsk Oblast head Svitlana Onyshchuk said.

In Shyroka Balka, Kherson Oblast, a Russian drone dropped explosives on a house at about 06:20, killing a 74-year-old woman and injuring a 68-year-old man, regional prosecutors reported.

Russia injured three women in a Kharkiv suburb, Kharkiv Oblast head Oleh Syniehubov said. In the Nikopol district, a 24-year-old woman was injured, Dnipropetrovsk Oblast head Oleksandr Hanzha said.

Poland scrambled military aircraft as Russia struck targets in western Ukraine, its Operational Command said.

The past day's toll

Over the past 24 hours, Russia killed two people and injured 18 in Zaporizhzhia and the Zaporizhzhia district, regional council head Ivan Fedorov said. In Sumy Oblast, one man was killed and 14 people were injured, including two 12-year-old boys, the regional administration reported.

In Kherson Oblast, four people were injured, including a child, Kherson Oblast head Oleksandr Prokudin said. In Mykolaiv Oblast, a Russian drone injured two children aged three months and one year, acting oblast head Heorhii Reshetilov said. Three people were injured in Kharkiv Oblast, Syniehubov reported.

In Donetsk Oblast, Russia killed 35 people and injured 25 on 8 October, Donetsk Oblast head Vadym Filashkin said. Thirty-two of them died in Kramatorsk, most in a Russian bomb strike on two passenger buses.

Ukrainian forces are advancing east of Sloviansk and Kramatorsk, and even Russian milbloggers now acknowledge it, the Institute for the Study of War (ISW) said on 8 October. The gains may follow months of groundwork like the one that preceded Operation Vivaldi near Lyman, which Ukraine says returned 176 km² to its control. Russian commentators are already doubting that Moscow can reach the two cities.

Russia's years-long push on the Fortress Belt, the chain of cities anchoring Ukraine's defense in Donetsk Oblast, has been stalling since Vivaldi began. Unable to take those cities, Russia keeps hitting them from the air. On 8 October, a Russian bomb killed 30 people on two buses in Kramatorsk.

Across the Siverskyi Donets

Russian milbloggers said Ukrainian forces liberated Ozerne and advanced east of Pyskunivka toward Kryva Luka, ISW reported. They also acknowledged that Ukrainian troops drove Russian forces out of Pyskunivka. Ukrainians are now counterattacking toward Kryva Luka from the west and northwest, from across the river.

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ISW called the repeated Russian claims of a river crossing notable, because the Siverskyi Donets is a significant natural obstacle. Kryva Luka is a dominant height just south of the river. From there, Ukraine could launch further counterattacks. Ukrainian forces appear to have pushed Russian troops off both banks in this area, ISW assessed.

The heights Russia wanted

After Vivaldi cleared ground near Lyman in September, Russia shifted its push south toward Mykolaivka and Sloviansk. Russian forces likely see Mykolaivka, just east of Sloviansk, as a primary objective, ISW said. Its heights would favor an offensive on the city. Ukrainian pushes northeast and southeast of the town now deny Russia that terrain.

East of Kramatorsk, milbloggers claimed Ukrainians liberated Malynivka and advanced between Fedorivka Druha and Holubivka. They also reported gains into southern Minkivka and near Fedorivka. The lines remain tangled. Geolocated footage shows Ukrainian forces striking a Russian position in central Tykhonivka after what ISW assesses was a Russian infiltration.

ISW said the counterattacks may point to a broader Ukrainian goal: pushing Russian forces east, away from the Sloviansk–Kramatorsk area and toward the Siverskyi Donets–Donbas Canal.

The Vivaldi playbook

The counterattacks have run for weeks. On 29 September, Ukrainian military observer Kostiantyn Mashovets reported them in the same areas, saying Russia's 3rd Combined Arms Army had failed to make significant gains. ISW assesses that the attacks build on months of shaping meant to wear down Russia's offensive capacity.

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Vivaldi’s secret weapon was the targeting, not the robots: Third Corps reconnaissance mapped Russian command nodes, then hit them to cause panic

Before Vivaldi, Ukrainian forces targeted Russian drone operators, gaining drone superiority before the counteroffensive. They used the same approach ahead of their Oleksandrivka counterattacks in early 2026.

Moscow appears to see the pattern. A Ukrainian military official said on 7 October that Russia is moving drone units and Spetsnaz from quieter sectors to the Sloviansk–Kramatorsk direction. Ukraine also reorganized its command in and around Donetsk Oblast in early September, which may be blunting Russian attacks from the east, ISW said.

"Distant" and "doomed"

One Russian milblogger called an advance toward the Sloviansk–Kramatorsk area a "distant" prospect, ISW reported. A Russian offensive from Siversk toward Sloviansk may be "doomed" to failure or heavy losses unless Russia retakes the forests south of Lyman, he said.

The counterattacks east of the two cities appear to support Vivaldi, ISW assessed. Together with Russia's defeat north of the river, they could disrupt Russia's offensive toward Sloviansk from the east entirely.

If Ukraine holds Kryva Luka and keeps Russia off the Mykolaivka heights, Moscow's pincer on Sloviansk and Kramatorsk loses the ground it was built on.

Russian forces struck the eastern Ukrainian city of Kramatorsk on the morning of 8 October, hitting two route buses carrying residents and killing dozens of civilians. The Donetsk Oblast prosecutor's office opened a war-crimes investigation.

Russia has turned everyday movement in frontline Donetsk Oblast into a lethal risk, striking city buses, ambulances, and cars in places its army has not been able to capture.

A route bus run turned deadly

The attack came at around 10:00, catching two route buses in the impact zone. The prosecutor's office said the attackers likely used a UMPB D-30SN. HUR, Ukraine's military intelligence, describes it as a guided glide bomb that can fly up to 100 km when released from an altitude of 12–15 km and carries a warhead equal to a FAB-250 aerial bomb.

The toll rose through the day, from 12 dead in the first reports to 30 killed and 20 wounded by 14:55, Donetsk Oblast head Vadym Filashkin said. Across Donetsk Oblast, Russian attacks killed 33 people that day, including the 30 in Kramatorsk and three in nearby Bilenke, the State Emergency Service said. Ukrainian President Volodymyr Zelenskyy said the strike would not go unanswered.

Buses pulled off the roads

Filashkin ordered the Kramatorsk and Sloviansk city military administrations to suspend public transport, citing the sharp deterioration in security. Buses had become an attractive target for Russian forces, he said, and the authorities could not risk the lives of passengers and drivers. He also urged everyone still in Donetsk Oblast to leave for safer parts of Ukraine. Kramatorsk is a frequent target of Russian attacks. Russia had not commented on the strike as of publication.

The city has been under daily fire. On 5 October, Russian FPV drones hit ambulances and an apartment block in Kramatorsk, killing a woman and wounding four, the prosecutor's office reported. Over the previous day, Russian forces shelled Donetsk Oblast settlements 31 times and 256 people left the front line, Filashkin said.

Russian FPV drones hit three ambulances and, separately, a residential high-rise in Kramatorsk late on 5 October, the Donetsk Oblast Prosecutor's Office said. The strike on the high-rise killed a woman and injured another, and three medical workers were wounded trying to save their vehicles. Prosecutors have opened war-crimes investigations.

Russian drones attack Ukrainian civilians every day, and Ukraine's UN envoy has cited "human safari" and repeat strikes on medics as grounds to strip Moscow of its Security Council seat. Kherson, Nikopol, and Kramatorsk are all cities where drone operators pick civilian targets in real time.

Drones aimed at ambulances

Between 22:00 and 22:25, the Russian army deliberately directed two FPV drones at ambulances parked on a Kramatorsk street, prosecutors said. Three workers of the ambulance service were injured while trying to save the vehicles after the first hit. They suffered blast injuries, shrapnel wounds to the body and limbs, burns, and concussions, and received medical care. Three ambulances were damaged.

FPV drones are flown by an operator watching a live camera feed until the moment of impact. Prosecutors called the strike targeted.

A woman killed at home

At 22:10, a Russian drone hit a residential high-rise in the city. A 49-year-old woman was killed. Another resident, a 68-year-old woman, suffered a broken foot, shrapnel wounds to the body and limbs, and a concussion, according to prosecutors. The Kramatorsk district prosecutor's office has opened criminal proceedings over war crimes.

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Across Donetsk Oblast, Russian attacks killed three people on 5 October, in Sloviansk, Druzhkivka, and Sukhanivka, and injured 11, Donetsk Oblast head Vadym Filashkin said. His morning tally, posted before the prosecutors' report, did not include the Kramatorsk death.

Kramatorsk under the drone hunt

Russian drone operators have hunted people in Kramatorsk for months. In June, a Russian pilot chose to kill a man he saw on a city street. Russia strikes the city daily, and in August it dropped eight FAB-250 bombs on Kramatorsk, killing one person and injuring 18.

The same drone hunting of civilians has run for years in Kherson, where Ukraine's Security Service has named 10 Russian servicemen it ties to the "human safari." A UN inquiry has traced the Kherson campaign up the chain of command. In April, ISW found Russians using such tactics across southern Ukraine, including in Nikopol.

Medics have been repeated targets. In March, a Russian FPV drone killed two medics in an ambulance in Kharkiv Oblast, and in February, Russian drones hit an ambulance and a shop there, killing three. In Kyiv, a Russian missile attack damaged a maternity hospital in September.

Russia lost almost 300 km² of Ukrainian territory on net between March and September 2026, and it likely gained no ground in September despite its heaviest casualties of the year, the Institute for the Study of War (ISW) assessed. Ukraine's Operation Vivaldi accounts for much of the swing. The think tank notes that Ukraine's secrecy around such counterattacks makes exact monthly tallies hard.

Russia has pressed attacks along the entire front through 2026, accepting mass casualties for marginal ground, and its battlefield year has already been called its worst since 2023. Its losses have been outpacing its recruitment for months.

Russia came out behind in September

Russian forces seized 175.54 km² in September but lost 256.35 km², a net loss of 80.81 km², or minus 2.69 km² a day, ISW calculated. The balance stayed negative when Russian infiltrations into areas Russia does not control are counted: Russia seized or infiltrated 143.2 km² but lost 318.38 km², a net loss of 175.18 km².

The September figures include at least 147 km² near Lyman that Ukraine liberated over earlier months, but that ISW recorded only once details of Operation Vivaldi emerged in September. The operation already disrupted Russia's plan to encircle the Fortress Belt cities from the Lyman and Dobropillia directions.

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Almost 300 km² lost since March

Russia's rate of seizing territory dropped sharply in March 2026 and has stayed low, or even negative, since, ISW found. After controlling for the gains Ukraine made during Vivaldi, Russia lost control of 293.59 km² net across the front since March. Counting infiltrations, it gained a presence in only 174.44 km² over the same period.

ISW's monthly chart shows net Russian losses of 116.01 km² in April and 281.1 km² in May, modest gains in June, July, and August, and a net loss again in September. Oleksandr Syrskyi, then Ukraine's commander-in-chief, reported in June that Ukrainian forces had recaptured 100 km² in May.

More than 46,000 casualties for no ground

Russian forces suffered 46,230 casualties in September, Ukraine's General Staff reported. It is the third straight month above 40,000 and the highest monthly toll of 2026, by Kyiv's count. Monthly Russian casualties have climbed from 32,980 in April to 42,860 in July and 42,020 in August, ISW's chart shows.

Russia keeps suffering heavy personnel losses while making extremely limited or even net-negative territorial gains, ISW said, and its current force generation system still recruits fewer soldiers than it needs to replace them.

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Ukraine's effective operational security around Vivaldi, likely to continue in future counterattacks, will make meaningful month-to-month assessments of Russian gains and losses hard, the think tank added.

The Institute for the Study of War (ISW) published a map in its analytical report on 24 September that contrasts the claimed Russian encirclement with the location of Russian forces as assessed by the experts. Based on the evidence observed by ISW, the nearest area where Russian forces are present is 10.2 kilometers from the southeastern outskirts of Dobropillia.

Russia has been spreading disinformation about its successes around Dobropillia as part of what ISW calls a cognitive warfare effort to portray Ukrainian defenses as on the verge of collapse. Russia's Defense Ministry published a map claiming the city was surrounded. ISW's own map challenges it. The Ukrainian military says the city remains under its control.

Russian Defense Ministry claims it is already destroying encircled Ukrainian troops in Dobropillia and moving further

Units of Russia's Center Grouping of Forces continue combat operations against encircled Ukrainian forces in the Dobropillia area of Donetsk Oblast while simultaneously advancing toward Oleksandrivka, the Russian Defense Ministry claimed. ISW analysts, meanwhile, said they have not observed evidence supporting Russia's claim that the city is encircled. They also noted that Ukrainian officials "directly refute" the claim.

ISW observed evidence that Russian infiltrators, small groups, were operating east and northeast of Dobropillia on 19 and 20 September. The institute did not assess that these infiltrators had consolidated their positions.

Ukrainian forces maintain positions south and northeast of Dobropillia, military observer Kostiantyn Mashovets said on 20 September, according to ISW.

Russian forces have not made major gains in the Dobropillia direction, the chief of staff of an artillery reconnaissance battalion said on 22 September, according to the institute. On the same day, a Russian milblogger described the "alleged Russian encirclement of Dobropillia" as potentially meaning not the direct presence of infantry, but only the establishment of fire control over Ukrainian logistics, including roads west of Dobropillia and toward Sviatohorivka, according to ISW.

ISW noted that Russia's pervasive military culture of lying—what Russian milbloggers themselves call "beautiful reports"—has degraded the Defense Ministry's own ability to understand the battlefield and enabled inflated claims like the Dobropillia encirclement.

Russia uses this disinformation as a "diversion"

In its statement, the Russian Defense Ministry itself described Dobropillia as a "strongly fortified settlement" whose seizure would threaten key Ukrainian supply lines running from Dnipropetrovsk Oblast toward the Fortress Belt—the Sloviansk-Kramatorsk-Druzhkivka urban agglomeration.

Russia has recently renewed its attempts to break through toward Dobropillia.

Third Army Corps Commander Andrii Biletskyi said that Russian forces sought to bypass the fortified cities through Dobropillia and link up with troops advancing from north of Lyman, rather than launch a direct assault. ISW noted on 16 September that the Vivaldi operation disrupted Russia's two-pronged plan. In its 24 September report, ISW said Russia's claims about Dobropillia were partly intended to divert attention from Ukraine's elimination of the Russian salient north of Lyman, which has likely forced Russia's command to rethink its wider encirclement plans.