Kyiv on Sunday claimed responsibility for an overnight drone attack on a Russian oil refinery, making it the second attack on the same site in less than two weeks. Ukraine's military said that "the Defense Intelligence of Ukraine hit the facilities of the Ryazan Oil Refining Company again.

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.

During the night from Saturday to Sunday, foreign drones—most likely Ukrainian—appeared over the refinery in the city of Ryazan, located about 125 miles southeast of Moscow. A series of explosions occurred.