Ukraine drone attack on Russia's Ryazan refinery; massive fire at oil complex Ryazan refinery, Russia, was targeted by Ukrainian drones last night, and following this attack a massive fire broke out at this industrial complex. Several news sources reported that at least 6 drones hit different parts of the refinery. The Ryazan refinery is one of the most important oil processing centers in Russia and produces products such as gasoline, diesel fuel, jet fuel and other petroleum products.