Ukrainian drones hit a Russian oil refinery in the city of Ryazan overnight, causing a fire and damaging equipment at one of Russia's biggest refineries, four industry sources told Reuters on Friday.

Russia says it shot down more than 120 drones overnight, in what would be one of the largest attacks of the war.

Video footage taken on Jan. 23 shows an alleged drone attack conducted by Ukrainian armed forces attacking the Rostneft Oil Refinery in Ryazan, Russia by using many long-range kamikaze drones.