A separate Ukrainian drone attack overnight into Sept. 22 set Rosneft's Kuibyshev refinery in Samara ablaze, with the fire continuing into the morning. The plant processes about 7 million metric tons of oil a year and had previously suspended operations in June following strikes.
Ukrainian drones also struck the Bashneft-Ufaneftekhim refinery in Ufa on Sept. 21, sparking a large fire more than 1,300 kilometers from the Ukrainian border. Ukraine said it had hit both the Ufa and Kuibyshev refineries.