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Several modules of the data center were completely knocked out of operation, Yandex said in a statement.
A UAV attack disabled several modules at the largest Yandex data center in Kaluga, reducing service and impacting a facility with 3,800 server racks.
Ukrainian drones hit two Yandex data centers in Ryazan and Kaluga on October 8-9, 2026, disabling modules tied to YandexGPT supercomputer training.