Ukrainian drones struck the Gazprom Neftekhim Salavat oil refining and petrochemical complex in Russia's Bashkortostan republic overnight before Thursday, causing a fire at the facility. The attack was the fourth Ukrainian drone strike on Russian refineries in three days, according to Ukrainian military officials. The complex, one of Russia's largest, processes up to 74 million barrels of oil annually into gasoline, diesel, and other products.