Ukrainian forces in the port city of Mariupol are refusing to stop fighting, after rejecting an offer from Russia to surrender.
Moscow claimed that, if Ukraine's soldiers laid down their weapons, it would allow for the safe passage of civilians out of the besieged city.
Authorities there say Russian forces bombed an art school where 400 people were sheltering.
While in Kyiv at least four people were killed during a bomb attack which gutted a shopping centre.
However an assessment by British intelligence claims that Russia's advance on the capital city is stalling.
