Ukraine launched fresh strikes on Russian energy sites overnight into Sunday, Russian authorities and media reported, while Kyiv denied Russian claims that a Ukrainian drone struck a key Kremlin-occupied nuclear plant.Drone debris set fire to a fuel storage facility in Russia’s southwestern Rostov region, Gov. Yuriy Slyusar reported on Telegram on Sunday. He said residents of nearby homes were evacuated.The drones also damaged civilian infrastructure in Saratov province, also in southwestern Russia, according to Gov. Roman Busargin. Astra, an independent Russian news channel, said an oil refinery was on fire in the regional capital, Saratov.Ukraine has stepped up its attacks on Russia’s oil and gas facilities in recent months, arguing the energy sector both funds and directly fuels Moscow’s more than 4-year-old invasion.Meanwhile, Kyiv denied Russia’s claims that a Ukrainian drone struck the Russian-occupied Zaporizhzhia nuclear plant, the largest in Ukraine and Europe.

Russian forces captured the plant in the early weeks of the war, and it remains close to the front lines in the southern Zaporizhzhia region, one of four Russia has formally annexed despite lacking full military control or international recognition for its actions.