Ukrainian drones set fire to two fuel depots around Sochi and hit a Russian air defense position overnight on 4 September, according to monitoring channels. They also reported that drones struck an explosives factory and a petrochemical plant in Bashkortostan the same night, more than a thousand kilometers from Ukraine. Russian officials acknowledged the depot fire and said nothing about the air defense site.

Two depots burned behind their anti-drone screens

Astra's OSINT analysts geolocated the fires to the Rosneft-Kubannefteprodukt depot in Sochi's Adler district and to the Lukoil-Yugneftprodukt depot on the federal territory of Sirius. Sochi mayor Andrei Proshunin confirmed a fire at a depot. The regional operational headquarters claimed there were no casualties. Sochi is a Russian resort city on the eastern Black Sea coast, about 600 km from the frontline in Ukraine.

The Ukrainian OSINT channel Cyberboroshno identified one of the hit sites as the BATO aviation fuel terminal, which fuels aircraft at airports across Krasnodar Krai. Every tank there stood behind purpose-built protective structures, Militarnyi reported, and the Lukoil site holds 12 tanks with a combined volume of about 8,400 m³. The burning depot sits roughly 100 meters from Sochi international airport, Russia's fifth-busiest by passenger traffic in 2024, the Russian outlet Agentstvo found.

Panoramic imagery from this year shows anti-drone netting around the tanks at both depots. Two days before the strikes, Russian Deputy Prime Minister Aleksandr Novak claimed Russian refineries were better protected than those in the UAE, and Russian President Vladimir Putin said their protection level was now completely different.

An air defense position caught fire near the Abkhazia border

Astra analyzed eyewitness footage and placed a detonation and fire at a launch position near the settlement of Sirius, by the Psou river on the Abkhazia border, where an S-300 or S-400 system is based. The Ukrainian monitoring channels Exilenova+ and Supernova+ said drones struck the air defenses directly. Russia's Defense Ministry and local authorities reported nothing about it.

Drones had tried the same area in May. A Ukrainian sea drone struck the Russian supply vessel Nefrit at Sochi port the previous day.

Explosives and petrochemicals hit in Bashkortostan

Drones reached Sterlitamak on the morning of 4 September, hitting the Avangard plant and the Sterlitamak Petrochemical Plant, footage published by Supernova+ shows. Residents reported a series of explosions, and one man said on video that about a dozen drones had already flown toward the petrochemical works. The frames show Ukrainian FP-1 strike drones. 

 Russia's Defense Ministry claimed it downed 490 drones overnight across several regions, occupied Crimea, and the Black Sea.

Finland shut more than 2,000 people into a rock-hewn shelter that is normally a sports hall in Kuopio on 2 September, with some remaining overnight to practice operating the facility, the Associated Press reported. The two-day exercise, Shelter 2026, was the largest civil defense drill in Europe since World War II, by AP's account. Its scenario had cyberattacks cutting power and water while the threat of Russian missile strikes grew.

What two hours underground exposed

Three colleges got the alarm at 11:30 on 2 September, and students had about half an hour to reach the shelter, called Luola, or the Cave, Yle reported that evening. Staff barred the doors behind them. Partitions divided the sports hall into rooms of about 200 people. There were not enough beds, so people rested in shifts, and 60 dry toilets served everyone. The internet worked poorly, and the air grew heavy after an hour. The site holds up to 7,000 people under emergency law.

Antti Haataja, preparedness chief at the North Savo Rescue Department, said the move underground went calmly and faster than he expected. A real emergency would put those inside to work, he added, including emptying the toilets. More than a hundred people stayed through the night into 3 September, Yle said, while AP described hundreds sleeping on trestle beds.

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Finland is reading Ukraine's experience

Retired Finnish Army Colonel Asko Muhonen, who organized the drill, said Finland has to learn from Ukraine, where people sometimes have only minutes to reach a metro station. What matters is cover they can actually get to, not a shelter that survives a nuclear blast. Ukraine's parliament is advancing a Finnish-style bill that would put one within 10 minutes of everyone.

Dmytro Untila, 20, a Ukrainian student in Kuopio, was at home in Odesa when Russian missiles hit the city on 24 February 2022, and waited the strike out in his building's entrance hall, having nowhere better to go. Training like this would have helped in Ukraine, he said, "because nobody knew this could happen."

The pressure Finland and its neighbors are drilling against

Finland shares more than 1,300 km of border with Russia and joined NATO with Sweden after the full-scale invasion of Ukraine. Shelters answer only part of the pressure. Russia is running a campaign of sabotage across Europe, Western officials say, a Russian aircraft is suspected of having entered Finnish airspace on 20 August, and US intelligence has warned that Poland and the Baltic states may face wider Russian hybrid attacks for backing Kyiv.

On 4 September, Ukraine's military intelligence agency HUR published drone footage of an August operation against a Russian coastal missile launcher in occupied Crimea, it said on Telegram. Its special unit Group 13 struck the launcher and hit fuel trucks and a command vehicle on the peninsula in the same operation. 

What HUR says its operators hit

The target was a Bastion, the carrier of Zircon and Oniks missiles. Russia uses those missiles for terrorist strikes against Ukraine, HUR said.

Group 13 operators destroyed and struck two fuel trucks and a command-and-staff vehicle belonging to Russian forces, the agency said. It placed the work in August 2026 without giving a date or a place on the peninsula.

The footage shows the view from drone cameras closing on the targets. HUR did not say what kind of drones its operators used, and the unit works with both aerial and naval systems, including naval drones rigged to carry FPV drones.

Designated 3K55, the system defends a shoreline and hits both surface and ground targets, warships among them. It takes up to five minutes to deploy, fires supersonic P-800 Oniks and hypersonic Zircon missiles, and reaches from 300 to 600 km depending on the missile and the mode of use. It doubles as an air defense asset, tracking up to 50 objects along the horizon at up to 250 km with passive radar and 450 km with active radar. Russia has fielded it since 2010 and builds it in a mobile version and a silo-based one.

Other Ukrainian services have hit Bastions before

Ukraine's Navy said its forces struck a Bastion's launch positions and deployment site on the peninsula overnight on 16 August, without naming a unit. Ukrainian forces hit a Bastion launcher in the occupied village of Aktachi in March, and in February they struck the concentration area of the Russian brigade that operates the system in Crimea.

In an operation earlier in the summer, one of Group 13's uncrewed boats launched attack drones at two Russian radars in occupied Crimea without the vessel ever reaching shore.

Strikes on the peninsula continued overnight

Drone attacks on occupied Crimea have been running for weeks, and they continued into 4 September, though what was hit this time is not yet known. 

Explosions sounded in Sevastopol and Dzhankoi district, Suspilne reported. Monitoring channels logged blasts and drone flights past 04:00, and satellite imagery showed a fire west of the airfield at Hvardiiske, with the cause unconfirmed. Russia's Defense Ministry claimed 490 drones downed over Crimea, other occupied territories, and Russian regions.