Ukrainian drones reportedly struck the Azot chemical plant in Novomoskovsk, Tula Oblast, Russia, one of the country’s largest nitrogen-fertilizer producers, on 28 October. The attack set off a major fire at the facility overnight, Exilenova+ reports.

Russia’s munitions need explosives, and those explosives start from nitric acid, a basic industrial chemical. Azot is one of Russia’s biggest sources of it, a plant Ukraine has struck before and hit again overnight.

Nitric acid feeds Russia’s explosives

Military observer Oleksandr Kovalenko explains why the plant matters for Russia. Azot is one of Russia’s biggest producers of ammonia, ammonium nitrate, urea, and methanol, and in 2023 the company reported supplying more than 60 countries, he says.

For the war economy, he argues, one product stands out from the rest.

“The main reason for its strategic importance is nitric acid and its role in producing explosives for munitions,” Kovalenko says.

The acid goes into the chemical synthesis behind some of Russia’s most powerful explosives, and ammonia, further up the chain, is the base feedstock that the whole of nitrogen chemistry runs on.

Azot supplies the makers, not the munitions

Kovalenko is careful not to overstate what the plant does. Ammonium nitrate, the compound most associated with Azot, is first of all a fertilizer and only secondarily a raw material for industrial explosives.

“The fact of its production alone does not mean the plant makes military munitions,” he stresses.

The same holds for methanol and the plant’s other chemicals, whose military weight depends on which enterprise they are shipped to and what it builds there.

What gives Azot its place in the war machine, in his account, is that it sits one step back from the weapon, feeding the factories that make explosives rather than making them itself.

“Azot does not necessarily produce finished explosives itself. Its role is to supply raw materials to the next-link enterprises that produce energetic materials,” Kovalenko says.

The clearest trace of that role runs through a single customer: recorded deliveries of nearly 5,000 tons of nitric acid to the Sverdlov plant, sanctioned by Ukraine for actions threatening its sovereignty, between 2022 and 2024, with data from 2026 showing the reagent concentrated among a handful of Russian firms.

Drones attacked a Russian tax-service data center overnight on 23 October, Ukrainian monitoring channel Exilenova+ reported. A chemical plant in the Urals was also attacked, and a fire broke out near a Russian bomber base by late morning. Russian officials admitted injuries and damage but blamed falling debris. Ukraine has not commented.

Ukraine's long-range drones have widened their target list from Russian refineries to the servers and chemicals that keep Russia's state and war industry running.

The tax service's data center in Gorodets

The target in Gorodets, Nizhny Novgorod Oblast, is one of the Federal Tax Service's two key data centers, which work as a geographically distributed pair. It stores and processes state registers, including tax databases, Exilenova+ said. The extent of the damage is unconfirmed. The site lies about 785 km from Ukraine's northern border in a straight line.

Eyewitness footage shows a blast and fire in the area of the data center, which serves both the tax service and the Finance Ministry, Russian Telegram channel Astra found. The center opened in 2015. Mikhail Mishustin, then head of the tax service and now Russia's prime minister, attended the launch.

Nizhny Novgorod Governor Gleb Nikitin claimed air defenses repelled 19 drones. Falling debris injured three people in the Gorodets district and damaged several homes, an educational facility, and an infrastructure facility, he said, and local schools switched to remote learning. A Pantsir air defense missile hit a house, Exilenova+ claimed, though officials recorded it as a drone hit.

This month, drones already hit three Yandex data centers and a VK data center near St. Petersburg.

A chemical plant behind Russia's gunpowder

In Berezniki, Perm Krai, smoke rose over Uralchem's Azot plant as air defenses fired, Astra reported. The regional security ministry announced a drone attack at about 06:00, and authorities closed the airspace within 50 km of the city. Ukraine's long-range Liutyi drones visited Berezniki, Exilenova+ wrote.

The attack on Azot was continuing in the morning, the channel wrote, adding that the plant covers about 140 hectares with some 90 production buildings. It makes ammonia, nitric acid, ammonium and potassium nitrate, and urea. Russian defense plants use its nitric acid to make explosives and gunpowder, including the Perm gunpowder plant, Astra said. Berezniki lies 1,500–1,600 km from Ukraine's border and the war zone.

Drones attacked Azot before, on 11 September. Earlier this year, Ukraine's Security Service hit Lukoil's refinery in the same region.

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Fire near a Su-34 base in Voronezh

Late in the morning, Voronezh Governor Aleksandr Gusev declared a missile alert, and explosions followed in the city. Gusev later claimed air defenses downed several "jet-powered aerial targets." Debris set dry grass on fire in a suburb and damaged outbuildings and several cars, he said, adding that no one was hurt.

Eyewitness footage shows fire and smoke near Baltimor military airfield, Astra found. The strike preliminarily hit the grounds of a former military aviation engineering university and a nearby parking area for military aircraft, Exilenova+ said.

Baltimor hosts the 47th Guards Bomber Aviation Regiment, whose Su-34s Russia uses to strike Ukraine, Militarnyi reported, saying Ukraine attacked the airfield with missiles. Voronezh lies about 185 km from Ukraine's border. Smoke rose over the base after an attack on 27 May, and a fire broke out near it on 2 September.

Moscow counts drones, Kyiv stays silent

Russia's Defense Ministry claimed it downed 443 drones overnight over 20 Russian regions, including Nizhny Novgorod Oblast and Perm Krai, as well as Russian-occupied Crimea and two seas. Ukraine's General Staff has not reported on the strikes. A night earlier, drones reportedly hit a sanctioned weapons plant near Moscow.

Russia's air defenses now have to cover state servers and Ural chemical plants as well as the airfields its bombers fly from.