Russia launches fresh drone assault on Kyiv and Kharkiv, officials say

Ukraine is again under attack by Russian drones, officials say, after two days of major aerial assaults by both sides. 

There are reports of explosions in Kyiv and Kharkiv, where the mayor said residential buildings were on fire.

Moscow has been retaliating against Ukrainian strikes on the Russian border city of Belgorod on Saturday, which killed at least 22 people.

The number of fatalities in the Ukrainian attack on the Russian city of Belgorod has climbed to 22, Belgorod Region Governor Vyacheslav Gladkov said.

"To great regret, to great sorrow, the death toll from yesterday's shelling of Belgorod has increased to 22. One of the victims died in a hospital overnight," he said on Telegram.