Ukraine Strikes Yandex Data Center for Two Consecutive Days, Cloud Services Damaged
nashnova research
Ukrainian drones struck two core Yandex data centers on consecutive days, knocking parts of its cloud service offline — whether two supercomputers used for AI training can be repaired is now the biggest open question.
Which two data centers were hit?
Day one: drones struck the Sasovo data center in Ryazan Oblast, operational since 2014. Yandex said it cannot confirm whether equipment can be repaired.
Day two: the Kaluga data center — roughly 150 km southwest of Moscow and one of Yandex's largest facilities — took hits, forcing multiple modules offline.
Kaluga hosts Yandex's internal infrastructure and Yandex Cloud. Sasovo hosts two of the company's three supercomputers, used for neural-network training.
Whose services went down?
Yandex's main consumer services — search, ride-hailing — were relatively unaffected after the first strike.
Some Yandex Cloud clients, however, suffered significant outages because their resources sat in the damaged zones.
Russian online property platform Cian reported website and app failures; several real-estate developers, retailers, and e-document providers also flagged disruptions.
This means → the real damage is not to the consumer experience but to business continuity for Yandex's B2B cloud customers.
Why are the supercomputers the biggest concern?
The two supercomputers hosted at Sasovo are the core compute behind Yandex's AI model training.
Yandex currently cannot confirm whether the machines can be repaired — if they are a total loss, replacement capacity inside Russia is hard to find on short notice.
In plain terms = search and ride-hailing can fail over to other facilities, but supercomputers for AI training cannot be replaced by spinning up a few extra servers.
This reflects a threat to Yandex's long-term AI capability far larger than the short-term disruption to everyday services.
Is this an isolated incident?
No. Earlier this summer, Ukraine struck the warehouse networks of Russian e-commerce platforms Wildberries and Ozon.
More than 20 Wildberries facilities were hit, destroying goods worth billions of dollars.
This means → Ukraine's target set has expanded from military assets to commercial infrastructure — tech-company data centers are no longer safe ground.
What kind of company is Yandex now?
Yandex is Russia's largest tech company, spanning search, ride-hailing, e-commerce, cloud computing, and AI.
In 2024, founder Arkady Volozh exited the Russian operations under a Kremlin-brokered deal; the Netherlands-registered parent has since rebranded as Nebius Group, completing its split from the Russian business.
In plain terms = today's "Yandex" is a purely Russian-operated entity — international capital has left, and the external resources it can mobilize after damage are very limited.
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