Nighttime strike hits Sasta plant and Yandex data center in Russia's Ryazan Oblast
A nighttime attack on October 8 caused a fire on the territory of the Sasta machine-building plant in Sasovo, Ryazan Oblast. The plant shares its site with a Yandex data center, and the hit triggered wide-scale outages across Yandex Cloud services. Ukrainian sources say the strike was carried out by Ukraine's Defense Forces.
Key points
- Fire broke out the night of October 8 on the territory of the Sasta machine-building plant in Sasovo, Ryazan Oblast
- A Yandex data center (LLC "Yandex DC") is co-located on the Sasta plant site, per Wikimapia and prior staff statements
- Sasta produces CNC metalworking machines used in Russia's defense, aerospace, transport and heavy industries, and has supplied Roscosmos enterprises
- Power supply issues in Yandex Cloud's ru-central1-b availability zone began at 1:31 a.m. on October 8; the company said the situation had not stabilized
- Outages hit Yandex Cloud computing, networks, storage, databases, Kubernetes, cloud services, AI, and security and monitoring systems; users reported problems with Yandex.Disk and Yandex.Documents
- Yandex confirmed an "incident affecting part of the company's infrastructure" and said there were no casualties and that main services were operating normally
- A separate fire was reported the same night at the Gazprom Neftekhim Salavat refinery in Bashkortostan, about 1,400 km from the Ukrainian border
Why it matters
The strike hit a sanctioned plant that supplies CNC machines to Russia's defense, aerospace and heavy industries, including Roscosmos. Because the same site hosts a major Yandex data center, the hit also produced one of the more visible Russian civilian-cloud outages tied to a strike. A former Ukrainian NSDC counter-disinformation official confirmed Ukrainian responsibility, illustrating the growing reach of Ukrainian unmanned systems deep into Russian territory. A second fire the same night at a Bashkortostan refinery roughly 1,400 km from the border points to a broader overnight campaign.
What happened
On the night of October 8, a fire broke out on the territory of the Sasta machine-building plant in Sasovo, Ryazan Oblast, Russia, in an area that also hosts a Yandex data center (LLC "Yandex DC"). OSINT analysts at Astra identified the fire site using eyewitness footage, and Exilenova+ published photos and video from the moment of the attack. Yandex reported an "incident affecting part of the company's infrastructure" and said there were no casualties, with main services operating normally; Yandex Cloud separately cited power supply problems in its ru-central1-b availability zone beginning at 1:31 a.m. on October 8 and warned that the situation had not stabilized about 40 minutes later. The Yandex Cloud disruptions affected computing capacity, networks, storage, databases, Kubernetes, cloud services, AI, security and monitoring systems, and users reported problems with Yandex.Disk and Yandex.Documents. Andriy Kovalenko, former head of the Center for Countering Disinformation at Ukraine's National Security and Defense Council, said the fire was the result of a strike by the Defense Forces of Ukraine on the Yandex data center in Ryazan Oblast; the General Staff of the Armed Forces of Ukraine had not officially commented at the time of reporting, and Russian authorities had not commented either. The Russian Ministry of Defense claimed to have neutralized 399 drones overnight. Exilenova+ suggested the strike was likely carried out with missiles or jet-powered drones. Russia imposed flight restrictions that affected Pobeda airline operations.
How Ukrainian sources describe it
Ukrainian outlets frame the strike as a confirmed hit by the Defense Forces on a sanctioned, defense-relevant facility, citing Andriy Kovalenko's confirmation. Coverage emphasizes Sasta's role in Russia's military-industrial complex — CNC metalworking machines used in defense, aerospace, transport and heavy industries, prior deliveries to Roscosmos, and its sanctions status — as the strategic rationale for choosing the target. The disruption to Yandex Cloud is highlighted as evidence of the strike's reach into everyday Russian digital infrastructure. Earlier reporting by Ukrainian outlets described a pattern of Unmanned Systems Forces strikes on Russian energy, defense and industrial sites deep inside the country, including targets located from several hundred to over a thousand kilometers from the border.
Where reporting differs
Different Ukrainian outlets list different sets of countries as having sanctioned Sasta. Українська правда includes Canada, Switzerland, the EU, the UK, Australia, New Zealand, the USA, and Japan; ZN.UA and НВ omit the USA from the list while still including Japan alongside the others.
Background
The Sasta plant had been under international sanctions from a broad coalition of countries before the strike. It produces CNC metalworking machines rather than finished weapons, but those machines are needed to manufacture high-precision metal parts used across Russia's defense, aerospace, transport and heavy industries, and Sasta has previously supplied specialized machines to Roscosmos enterprises. The Yandex data center in Sasovo, opened in 2011, is one of Yandex's significant infrastructure sites; the city administration said in 2022 that Yandex had invested more than 6 billion rubles over 11 years, and the facility has a reported capacity of up to 12 MW for tens of thousands of servers, with staff having publicly confirmed its Sasovo location in the weeks before the strike. The Yandex DC site and Sasta plant share the same territory according to Wikimapia and prior staff statements. In the months before the strike, Ukraine's Unmanned Systems Forces had carried out a series of strikes on Russian energy and industrial targets deep inside Russia.