Russia has launched its largest missile and drone assault on Ukraine since August, targeting the country’s energy infrastructure as winter approaches.

Blasts rang out across Ukraine's capital Kyiv and other cities early on Sunday, as Russia staged its biggest missile attack since August and targeted power facilities with the winter setting in, officials said.

Russia has pounded Ukraine with "one of the largest" aerial attacks it has suffered in an assault that targeted the country's energy infrastructure, Kyiv's Foreign Minister Andriy Sybiga has said.