During his closing statement at the Nato summit in Washington US President Joe Biden made his worst gaffe to date, introducing Ukrainian President Volodymyr Zelenskiy as “president Putin” on July 12. Biden realised his mistake immediately and quickly correcting himself. “President Putin? He is going to beat Putin! President Zelenskiy! I’m so focused on beating president Putin you got to worry about it!” Biden said. Zelenskiy laughed the mistake off and responded, “I’m better.” But the incident was very embarrassing and comes on top of Biden’s disastrous performance in his recent debate with pr…