Russia suffered vastly more casualties than Ukraine in September, a senior NATO military official told Bloomberg. Ukraine’s General Staff put the month’s Russian toll only slightly lower.

September’s toll lands on a recruitment system that was already falling short. Ukraine’s military intelligence (HUR) estimated that Russian losses outran new contracts in June and July, when monthly losses ran lower. In August, Ukrainian President Volodymyr Zelenskyy, citing military intelligence, warned that Russia is preparing a mass call-up after its parliamentary elections. That vote ended on 20 September.

Where the numbers come from

Russian casualties passed 50,000 in September, up to 28,000 of them killed, the official said. Ukraine’s losses over the same month came to about 5,000, according to the official, who spoke on condition of anonymity. Russia does not release casualty figures, Bloomberg noted. In late August, Pavlo Palisa, deputy head of Ukraine’s Presidential Office, put Russia’s July losses at 43,000 killed and wounded. Bloomberg could not confirm his figures.

To push forward, Russia keeps feeding troops into “kill zones,” the official said. These are stretches of ground saturated with armed drones, mines, and artillery fire. Maksym, call sign Rumyn, is a deputy company commander in the 46th Airmobile Brigade’s drone battalion. In April, he said the zone once ran 3–5 km deep and is now several times larger.

Explore further

Ukraine suffered 10 times fewer casualties than Russia in Vivaldi counteroffensive, veteran says. Ukraine’s innovations in drone and ground robot tactics are changing frontline warfare

Rising stakes for Moscow

Russia’s defense spending is expected to near $199 billion this year, Bloomberg reported, citing two sources close to the government. That is about 40% above the plan the government set in late 2025.

Russian President Vladimir Putin would struggle to wind down the invasion without a political cost, Martin Jäger said last week. He heads Germany’s Federal Intelligence Service (BND).

Units of Ukraine’s Unmanned Systems Forces have killed or wounded more than 100,000 Russian troops since the start of 2026. That is more than 150,000 since the force was created on 11 June 2025, the force said on Telegram.

Drones have become the deadliest weapon of this war, accounting for about 96% of Russia’s battlefield casualties earlier this year. These hits are verified on video in the military’s Delta system, which is how the force counts only the losses its own pilots confirm.

“Behind these figures is the daily combat work of our soldiers, thousands of sorties, precise strikes, and the constant improvement of unmanned technologies,” Ukraine’s Unmanned Systems Forces said.

Each strike reduces Russia's combat potential and reflects the coordinated work of the force’s units, it added.

A toll that keeps climbing

Overall, drone branches of the Ukrainian Army had carried out more than 1 million verified strikes on enemy targets since January, killing or seriously wounding about 193,500 Russian troops, Ukraine’s Defense Ministry reported in July.

Those strikes roughly doubled over the first half of the year, from about 105,800 in January to more than 200,000 in June, the ministry noted.

Meanwhile, Commander of the separate Ukrainian Unmanned Systems Forces Robert “Madiar” Brovdi says the numbers are still growing. In the first five days of October, the force’s pilots killed or wounded 2,699 Russian soldiers, 39.7 percent more than in the same period of September.

He tied the rising number to Russia's assaults in Donbas, as the offensives for the fortress-belt cities that have been Ukraine's protection against full region's occupation since 2014, were ongoing.

Why the drone branch matters

The force fields are the cheap, fast weapons that now do most of the killing on the front. Interceptor and strike drones let Ukraine hit troops, logistics, and command posts while keeping its own soldiers farther from the fight.

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.

Explore further

Ukraine’s Vivaldi counteroffensive disrupts Russia’s plan to encircle Donetsk Fortress Belt – ISW

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.

Explore further

Russia’s mass drone attacks on Ukraine have a goal—likely Ukraine’s capitulation by spring 2027, ISW says

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.