Yandex said Tuesday it had restored access to 97.16% of customer data in Yandex Cloud after attacks on its data centers and that 2.84% cannot be restored¹.

The company's press service attributed the unrestorable share to critical damage to equipment and to those customers having no backups on the platform¹.

"Engineers managed to restore access to 97.16% of customer data in Yandex Cloud after the attacks," Yandex said, according to Meduza¹.

Yandex said customers who used its cloud backup tools lost no data¹.

Meduza, citing a Yandex Cloud report on 2025 results, said the lost data could amount to roughly 100,000 terabytes and tens of millions of files¹.

Ukraine began striking Yandex data centers in October¹. Over about a week, Ukrainian drones attacked three of the company's six data centers, in Sasovo in the Ryazan region, Kaluga and Vladimir, Meduza reported¹.

Kommersant, cited by Meduza, reported that replacing damaged equipment could take about six months¹. After the attacks, Yandex moved all three of its supercomputers to a new location and withdrew its annual revenue forecast, Meduza said¹.

Reuters also reported the company's account that nearly 3% of cloud customer data was lost after the attacks; its full article was not independently readable for this filing².