Moscow, May 31 -- Ukraine launched fresh strikes on Russian energy sites overnight into Sunday, May 31, 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 faciliti...