The short version
- Yandex reported serious damage to its Sasovo data center and partial outages at its Kaluga facility following Ukrainian drone attacks.
- The strikes target critical digital infrastructure, potentially forcing Russia to divert military resources for repairs and disrupting AI development capabilities.
- Kyiv frames the actions as reciprocal measures against recent Russian assaults on Ukrainian servers, while Moscow claims the targets support military intelligence.
A major disruption has emerged in Russia’s digital infrastructure after Ukrainian drone strikes damaged two of five data centers operated by Yandex, the country’s leading technology company. The attacks, which occurred over a forty-eight-hour period, have forced the firm to suspend operations at one facility and take parts of another offline. This development represents a tangible shift in the conflict, moving beyond traditional military targets to strike at the commercial and technological backbone that supports daily life for millions of Russians.
Yandex, frequently compared to Google for its dominance in search, ride-hailing, and food delivery, confirmed that its data center in Sasovo, located in the Ryazan region, was severely damaged overnight into Thursday. The company stated that operations at this site were completely halted. A second strike hit a facility in Kaluga, a region southwest of Moscow, on Friday morning, resulting in partial infrastructure failure. While Yandex reported no injuries to its own staff, local officials in Kaluga noted that nine people were injured during the broader attack on city infrastructure.
The operational impact is already being felt by users, though the full extent remains difficult to quantify. The company warned that restoring normal service levels would be challenging and unpredictable. Specific disruptions include temporary unavailability of certain artificial intelligence chatbot functions and potential issues with smart home devices. Yandex emphasized that these data centers are critical for maintaining its ecosystem, which serves tens of millions of people, and noted that engineering teams were working continuously to mitigate the damage.
The strategic significance of the Sasovo facility extends beyond general internet services. It houses two of the three supercomputers used to develop Yandex’s proprietary AI models. It remains unclear whether these high-value computing assets survived the strike intact. The loss or degradation of this capacity could hinder Russia’s progress in domestic artificial intelligence development, a sector Moscow has prioritized for both civilian and military applications.
President Volodymyr Zelensky framed the strikes as a direct response to weeks of Russian attacks on Ukrainian data centers. He described the action as a mirror-like retaliation aimed at disrupting revenue streams that fund the war effort. By targeting commercial infrastructure, Kyiv aims to force Moscow to divert resources away from the front lines to protect and repair civilian digital assets. This strategy seeks to impose economic and logistical costs on Russia’s ability to sustain its military campaign.
The escalation in attacks on digital infrastructure reflects a broader trend in the ongoing war. Both sides have intensified efforts to degrade each other’s technological capabilities. In late September, a Russian drone struck a business center in Kyiv, killing four people and damaging a local data center. That incident caused internet outages for approximately 100,000 households in the capital and surrounding regions. Some Ukrainian companies have since begun migrating data to servers located abroad to ensure continuity.
Moscow has justified its own strikes on Ukrainian digital infrastructure by claiming these facilities are utilized by military intelligence agencies. However, Kyiv accuses Russia of deliberately targeting civilian networks, particularly as winter approaches. Historical patterns show that Russia has previously escalated attacks on energy and communication grids during colder months to pressure the population and strain state resources. The current cycle of retaliation suggests a deepening entanglement of civilian technology in the conflict.
The Kaluga data center is one of the largest in Russia, covering 130,000 square meters and consuming electricity equivalent to that used by 220,000 households in the United Kingdom. Its partial outage highlights the vulnerability of large-scale energy-intensive infrastructure to precision drone strikes. As Yandex works to stabilize its services, the incident underscores the growing risk to critical digital assets in wartime zones.
Looking ahead, the durability of Russia’s tech sector will likely face increased scrutiny and pressure. The diversion of resources to repair damaged capacity could have long-term implications for service reliability and investment confidence. Meanwhile, Ukrainian firms continue to adapt by decentralizing their data storage, reducing reliance on vulnerable domestic infrastructure. The conflict’s evolution into the digital realm presents new challenges for both civilian populations and state actors.
This episode marks a significant milestone in the hybrid warfare tactics employed by both nations. By demonstrating the ability to strike deep inside Russian territory and disable key technological nodes, Ukraine has signaled its capacity to impose direct costs on Moscow’s domestic economy. The response from Russian authorities and the subsequent measures taken to protect remaining infrastructure will shape the next phase of this digital dimension of the war.
Sources behind this briefing
Go to the original reporting
- BBC World↗Russian search engine Yandex struggles after Ukrainian strikes on data centres
