Russia bombarded Ukraine’s second-largest city with massive strikes in the early hours of Saturday, its mayor said, one night after Moscow carried out one of the war’s largest aerial assaults on Ukraine.

Russian forces have accelerated attacks on Ukraine in recent weeks, with the Kremlin vowing to retaliate over a brazen attack on its air bases last weekend.

The Kremlin said on Friday the Ukraine war was "existential" for Russia, after it launched a wave of retaliatory drone and missile strikes that killed at least four people.