The Russia-Ukraine drone war has reached digital infrastructure. Yandex, Russia's largest technology company, confirmed on October 8 that its data center in Sasovo, Ryazan region, was hit by drones and caught fire, forcing a full suspension of operations. It is the first attack of this scale on a Russian data hub since the war began. Multiple outlets, citing open-source intelligence, attribute the strike to Ukrainian drones.
Sasovo is the largest of Yandex's five major data centers, hosting tens of thousands of servers. In its statement, the company said the attack caused a fire, that it had suspended all operations at the site, and that it was dealing with the consequences and restoring services — without describing the extent of the damage. Yandex Cloud's status page showed a power outage in its ru-central-b availability zone beginning at 1:31am local time, advising customers to use other zones.
According to a 2021 company statement, the Sasovo facility housed two of Yandex's three supercomputers, built around Nvidia A100 chips and used to train YandexGPT, one of Russia's leading generative AI models. The company declined to say whether the supercomputers were affected.
The ripples spread quickly. Several Russian online services reported technical problems on Thursday, including real estate aggregator Cian, book portal Litmarket, the Russian Railways website, and the site of football club Spartak Moscow. Yandex said its core consumer services were unaffected, but cloud customers clearly felt the shock.
Notably, the data center shares ground with defense industry: it sits inside the Sasta machine-tool plant, which makes precision metalworking equipment for aerospace, energy, and defense, and was sanctioned by the United Kingdom in 2024. OSINT teams Exilenova+ and ASTRA geolocated the blaze to the facility. It remains unclear whether the target was the server halls, the factory floor, or both.
Yandex's statement was restrained: fire confirmed, shutdown confirmed, recovery underway; core consumer services unaffected; silence on the scale of damage and the supercomputers' fate. That is the standard playbook for a stricken company — reassure users and customers while denying the other side a damage assessment.
Ukraine has not formally commented. Moscow's response will be worth watching: Russia has spent the past month striking Ukrainian data centers and telecom infrastructure, including targets in central Kyiv.
The real signal is the "first." This year the mutual drone campaign's target list has kept growing: energy facilities, refineries, ports, oil- and grain-carrying vessels, e-commerce warehouses — and now data centers. There had previously been no confirmed major Ukrainian drone attack on a Russian data center.
The context is a Russian-initiated round: over the past month, Moscow hit Ukrainian data centers and telecom infrastructure. Sasovo looks like reciprocal retaliation — digital infrastructure is now a routine line item on both sides' target lists.
For Russia the blow is double. Yandex, "Russia's Google," anchors the country's AI and internet ecosystem; a data center outage hits not just its own services but thousands of enterprise customers on its cloud. Ukrainian strikes on Russian territory have already produced petrol-station queues, losses for small e-commerce businesses, and higher inflation — a data-center hit deepens the sense that the war is seeping into daily life.
The strategic layer runs deeper. In August, Vladimir Putin empowered the state to take control of critically important infrastructure deemed poorly protected against drones; Russia's RBC outlet reports businesses are now discussing building data centers in countries Moscow deems "friendly" — an admission that domestic server halls are no longer safe, and that "data going offshore" is on the agenda.
In the short term, the watch items are how fast Yandex restores Sasovo, whether the supercomputers survived, and how many customers drift away. In the medium term, whether both sides normalize data centers as targets will set the war's "digital intensity": after power grids and refineries, cloud and compute are the next front.
For the global tech industry, it is a reminder too: data centers were once considered safe rear-area assets. The fire over Sasovo proves that in the drone age, there is no rear area.