Ukraine fended off 36 Russian air attacks in and around the capital overnight while pro-Kyiv Russian fighters said they were battling Russian forces for a second day inside Russia, trading blame with Moscow for the deaths of two civilians.

The governor of Russia's Belgorod region on the border with Ukraine said on Sunday that fighting was ongoing on his side of the frontier and acknowledged pro-Ukrainian forces had taken Russians prisoner during cross-border clashes.

Russia has carried out a new massive drone attack on Ukraine's capital Kyiv. Kyiv's mayor Vitaliy Klitschko said a man died when drone wreckage fell near a petrol station. A woman was injured. Overall, Russia launched a record 54 so-called kamikaze drones on Ukrainian targets, 52 of which were shot down, Ukraine's Air Force reported.

The governor of Russia's Belgorod region on the border with Ukraine said on Sunday that fighting was ongoing on his side of the frontier and acknowledged pro-Ukrainian forces had taken Russians prisoner during cross-border clashes.

Russia launched a wave of air attacks on Ukraine early on Sunday, with air defence systems repelling all missiles and drones on their approach to Kyiv, the capital's military officials said.