Yandex data center in Kaluga hit by drone attack, modules disabled

Yandex reported that a drone attack on October 9 damaged infrastructure at its data center in Kaluga, completely disabling several modules and causing potential disruptions to some company services. Emergency services and Yandex specialists worked at the site to assess damage. The company stated there were no casualties among its staff, though regional authorities reported nine people injured in broader drone strikes across Kaluga city and surrounding areas.

The attack represents the second strike on Yandex data center infrastructure in two days. On the night of October 8, Ukrainian military drones struck the company's facility in Sasovo, Ryzan region, causing a fire and temporary shutdown. That attack disrupted services for Yandex users and third-party companies relying on its infrastructure, including railway operator RZD, telecom company Megafon, and several Russian media outlets.

Kaluga Governor Vladislav Shapsha reported that Ukrainian drones attacked the regional capital and several municipal districts on October 9, with air defense forces downing 26 unmanned aircraft over the region. He noted damage to city infrastructure including private homes across two municipal districts but did not specify which facilities were targeted.

Yandex shares on the Moscow Exchange declined approximately 4 percent following the announcement of the second data center strike within two days. The company stated the full extent of damage was still under assessment and noted difficulty in estimating recovery timelines. On October 9, Yandex announced agreements with cloud providers Selectel, K2Cloud, and VK Cloud to accelerate placement and reserve resources for affected clients.

The Kaluga data center, located in the Grabtsevo industrial park, was designed with capacity for over 3,800 server racks and projected total power output of 63 megawatts across approximately 130,000 square meters.