Yandex cannot say if the Sasovo data centre can be restored after the drone strike

Yandex said on Thursday it cannot yet say whether the equipment at its Sasovo data centre can be restored, after a Ukrainian drone strike set part of the site on fire and forced a full shutdown. The hub, in the Ryazan region, is one of five large Yandex data centres. It holds tens of thousands of servers. Two of the company's three supercomputers, used to train its AI model, are housed there. Yandex has not said whether those machines were damaged.

The company confirmed the strike after the independent channel Astra matched eyewitness photos and video to the Sasta machine-tool plant in Sasovo, which houses the data centre. Ukrainian channels Exilenova+ and Supernova+ said the fire followed a Ukrainian strike. Russia's defence ministry listed Ryazan among the regions where air defences shot down Ukrainian drones overnight on 8 October. Local authorities did not publish a damage account.

Yandex's first statement was narrower. It said an incident at Sasovo had affected part of the infrastructure, that the site was under control, and that no one was injured. Teams were restoring affected services. A later statement, reported by Reuters, went further on the hardware: the scale of damage was still being assessed, and the company could not confirm that the equipment could be brought back. Some services went dark. TV Rain reported that the auto-posting tool Postmypost and the Ryazan edition of Komsomolskaya Pravda were among the sites that dropped.

The supercomputers are the part of the building that is hard to replace on a short timetable. A commercial server hall can be rebuilt from stock. A training cluster sized for a national AI model is a longer order, and Yandex has only three of them, two at this site. If those two are lost, the training load moves to the third machine and to whatever capacity the company can rent. Yandex did not say which services depend on Sasovo alone. The shutdown of the whole centre, rather than a single hall, is the fact that makes the outage wider than a local fire.

President Volodymyr Zelensky, speaking to reporters in Kyiv, did not name Yandex. He said Ukraine was mirroring Russian attacks on data centres. The line places Sasovo in a pattern Kyiv has described, without a public claim of responsibility for this hall. Russia's account is the air-defence list. The physical account is Yandex's: fire, shutdown, no injuries, restoration unknown.

Sasovo is not Moscow. A strike on a regional hall still reaches users in the capital if that hall holds the training machines and a large share of ordinary servers. Five large centres is a small map for a company that runs search, cloud, taxis and an AI stack. Losing one, even for weeks, shows in the services that fail over slowly. Postmypost and a regional newspaper edition are the public symptoms. The unpublished list is whatever else was pinned to that building.

The open question is the one Yandex wrote down. Assessors are still inside the site. Until they say whether the equipment can be restored, the two supercomputers are neither confirmed lost nor confirmed saved. The centre itself is shut.