Putin ‘totally miscalculated’ Russia’s ability to occupy Ukraine, Biden says

US president tells CNN he believes Putin's objectives in Ukraine invasion were irrational but that he would not use a nuclear weapon

• What we know on day 231 of the invasion

Joe Biden has said he believes Vladimir Putin is a rational actor" who badly misjudged his prospects of occupying Ukraine, but does not believe he would resort to using a tactical nuclear weapon.

The US president told CNN on Tuesday that he believed his Russian counterpart had underestimated the ferocity of Ukrainian defiance in the face of invasion.