Day 57.Today we discuss the battles raging across the east of Ukraine and the siege of Mariupol, report on the latest diplomatic spat between the European powers and examine the news that Russia has tested a new nuclear warhead - the Satan II.Contributors:David Knowles (Host)Dom Nicholls (Defence & Security Editor)Francis Dearnley (Assistant Comment Editor)Theo Merz (Deputy Foreign Editor)See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.