Officials say Ukraine was under an ongoing Russian ballistic missile and drone attack early Friday that wounded at least three people.

Russia launched drones and ballistic missiles at multiple targets across Ukraine, Kyiv authorities said on Friday, in a deadly air assault that left at least four people dead and 20 wounded in the capital.

Operation of the city's metro transport system was disrupted because a Russian strike had hit and damaged a train between stations. The air attack also triggered fires in residential buildings.