Ukraine: What happened today, Wednesday, April 20?

According to the UN, the number of refugees who have fled Ukraine since the Russian invasion began has now exceeded 5m

Ukrainian soldiers walk on a destroyed bridge in Irpin, on the outskirts of Kyiv. Picture: AP/Emilio Morenatti

A Russian ultimatum to Ukrainian troops remaining in the besieged port city of Mariupol to surrender or die expired this afternoon with no mass capitulation.

In a statement issued early this morning, the Russian defence ministry said its forces opened a humanitarian corridor from the Azovstal plant, of the last main Ukrainian strongholds in the city.