US President Joe Biden has mistakenly introduced Ukraine’s Volodymyr Zelensky as “President Putin”.

It came as Biden comes under intense scrutiny over whether he is fit enough to continue for a potential second term.

Speaking at NATO and with the Ukrainian leader waiting to speak on stage, Biden welcomed “President Putin”.

He was quick to correct himself by saying: “President Putin? He’s going to beat President Putin.

“President Zelensky. I’m so worried about beating Putin, we’ve got to worry about it. Anyway.”

Joe Biden speaks as Volodymyr Zelensky looks on
Joe Biden speaks as Volodymyr Zelensky looks on (Source: Associated Press)

Zelensky joked “I’m better”, to which Biden said: “You are a hell of a lot better.”

The NATO summit in Washington was seen as a way for Biden to showcase his leadership on the world stage.

His stamina and effectiveness are under the microscope like never before and he’s struggling to quell the Democratic Party’s panic about his chances this November.

It comes in the wake of his disastrous performance in a debate with Donald Trump last month.

– Additional reporting by Associated Press