Civilians trapped as Russia bombards port city

In Mariupol, a strategic southern port near Ukraine's border with Russia, civilians are trapped by intense shelling.

"There has been no light, no heat, and no water now for two full days and we have hardly any food left," a resident tells the BBC.

Russian forces have taken control of Kherson, also in the south and the first major city to fall.

If Russia captures more southern cities, Ukrainian forces could be cut off from the sea.

Kyiv remains in government control and a large Russian armoured convoy is some distance away.

More talks between Russian and Ukrainian delegations have started in Belarus.

More than one million people have fled Ukraine since the invasion began.