Cloud services are usually imagined as something without coordinates. But on the night in Sasovo, Ryazan Oblast, this abstraction had a very concrete address: the territory of the Sasta machine-building plant. According to OSINT analyst data from Russian resource ASTRA, a fire broke out there, and according to Wikimapia, that is where the data center of LLC "Yandex DC" is located.
The location is reinforced by another detail. Last month, the data center employees themselves showed its equipment and directly stated that it was in Sasovo. So the location was established not only from maps, but also from open materials from the company itself.
What was confirmed and what wasn't
Yandex acknowledged the "incident" and power supply problems in a separate availability zone of Yandex Cloud, ru-central1-b. The outages started at night. After 40 minutes, the team reported that "the situation is currently not stabilized" and published a list of unavailable services.
The company did not name the cause of the failure. The connection between the fire at the plant and the power failure at the data center follows from the chronology and geolocation of eyewitness footage, but there is no direct confirmation from Yandex. There is also no official data on what exactly caused the fire. Headlines about an "attack" are based on ASTRA's interpretation, not on a statement from authorities or the company.
Why the "availability zone" matters
An availability zone is an architectural promise: several isolated sites with independent power supplies so that a failure in one doesn't stop the service. This promise only works if the client themselves deployed the application across multiple zones. Those who kept their database and applications in one zone were affected this time.
So the real test here is not for Yandex, but for its clients. How many of them had a backup in another zone? How many switched automatically, and how many waited for power to be restored? The list of unavailable services published by the team shows the extent of dependence on a single zone.
