Biden and Putin's "war of words" - what’s behind it

"A murderer without a soul" is what Joe Biden has effectively called Vladimir Putin. It was just the culmination of the difficult relationship of the US Democrats with the Putin, who seemed to like Republican Trump. Relations are at a low point, even at dead-end - the US is waiting for Putin to leave, but Russia – for Biden’s departure - and courtesy in this relationship is even less than it was during the Cold War, says professor at Cardiff Unviersity, Cold War historian Sergey Radchenko.