Ukrainian drones on Sunday struck an oil depot in southern Russia and a pumping station hundreds of kilometres from the front, Kyiv said, with Russian officials confirming strikes in the areas.

Kyiv has stepped up strikes on Moscow's infrastructure in the fifth year of war, hitting targets as far as the Urals in recent weeks.

Its army said drones hit a "dispatch station of a major oil pipeline" in Russia's Kirov region and an oil depot in the Rostov region, near occupied Ukraine.

It said the pipeline transported oil from Siberia to western Russia and Belarus.

The governor of the Kirov region, Alexander Sokolov, only said that Ukrainian drones had hit a "facility" and caused a fire, claiming no casualties and calling for calm.