If you need to catch up on the latest developments, here's what's been going on:
Russian President Vladimir Putin has ordered his troops to seal off Mariupol's Azovstal steel plant, where a last group of Ukrainian fighters is holding out
He said it would be "impractical" to storm it, but it should be blocked off so "not even a fly can escape"
Ukraine's deputy PM has demanded Russia allow an immediate humanitarian corridor from the steelworks, to allow 1,000 civilians and 500 wounded soldiers out
Elsewhere:
In the Russian-occupied southern city of Kherson, Ukraine's military says Russian troops are planning to "forcibly mobilise" the local population to fight for Moscow
The bodies of more than 1,000 civilians are being stored in morgues in and around the Ukrainian capital, Kyiv, the AFP news agency reports
An intelligence update by a top US defence think tank says Russia secured only marginal gains on Wednesday from continued assaults on Mariupol