Falling debris from destroyed Ukrainian drones disrupted railway power supply and train operations in part of the Volgograd region, the administration of the region in Russia's south said on Sunday, Reuters reported.

There were no injuries as a result of the attacks, the administration said on the Telegram messaging app, citing Governor Andrei Bocharov.

Russia's defence ministry said on Telegram that its air defence units had destroyed nine Ukrainian drones over the region. In total Russia downed 99 drones overnight over 12 Russian regions, the Crimean Peninsula and the Black Sea, the ministry said.

Russia's civil aviation authority Rosaviatsia said on Telegram that it had suspended flights soon after midnight at the airport in the city of Volgograd, the administrative centre of the Volgograd region. The flights had not resumed on Sunday morning, according to Reuters.