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 on Monday, describing Moscow's latest attack as "terrible.

Russia killed dozens of Ukrainian civilians in less than 48 hours on Monday and Tuesday, according to Ukrainian officials, two of the deadliest days in many months.

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