It was the deadliest attack on the Ukrainian capital in almost a year, and came as Moscow has intensified air assaults on the city.

At least seven people were killed and 28 injured in Kyiv overnight as Russian drone and missile attacks again rocked Ukraine's capital, Mayor Vitali Klitschko said.

Officials say a Russian missile and drone bombardment has killed at least 15 people and injured 156 others in Ukraine overnight, with the main barrage demolishing a nine-story apartment building in Kyiv.