Ukrainian drones overnight struck one of Russia's largest oil refineries, sparking a fire, according to Russian officials and Ukraine's military.

The strike on the Kirishi refinery, in Russia's northwestern Leningrad region, follows weeks of Ukrainian attacks on Russian oil infrastructure that Kyiv says fuels Moscow's war effort. The facility produces close to 17.7 million metric tonnes per year, or 355,000 barrels per day, of crude.