New Delhi, June 1 -- Kyiv on Sunday launched new strikes overnight on Russian energy sites. It has also denied Moscow's claims that a Ukrainian drone struck the Russian-controlled Zaporizhzhia nuclear plant.

Ukraine's General Staff said Ukrainian drones struck the Saratov oil refinery in southwestern Russia, causing a large-scale fire. It claimed the refinery has been supplying Moscow's war effort.

The refinery belongs to Russia's state oil enterprise, Rosneft. Local Russian Gov. Roman Busargin said Ukrainian drones had damaged civilian infrastructure, but did not give details. Astra, an independent Russian news channel, said an oil refinery was on fire in the city of Saratov.

Ukraine has stepped up its attacks on Russia's oil and gas ...