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. Ukrainian drones also damaged civilian infrastructure in Saratov province. Russian media outlets said an oil refinery was on fire in the regional capital, Saratov.