The head of the European Union's executive Commission, Ursula von der Leyen, has spoken of her outrage at Russia's deadliest onslaught on Kyiv since July - which also damaged the EU's delegation office in the Ukrainian capital.

At least 21 people, including four children, were killed and dozens more wounded in the bombardment, Ukrainian officials said.

A five-storey residential building was destroyed, and the EU mission and nearby British Council were damaged.