He added that Mr Putin’s military intervention “will end up costing Russia dearly”.
When taking questions from journalists on the invasion of Ukraine and the package of sanctions he had announced, on two occasions Mr Biden appeared to smile and laugh.
The US President seemed to be reacting to the clamour with which the reporters were trying to voice their questions.
Some continued to shout their questions when Mr Biden only took one question per reporter, and would not take follow-ups.
