WASHINGTON: United States (US) President Joe Biden mistakenly referred to Ukrainian President Volodymyr Zelenskyy as "President Putin" during a press conference in Washington following the NATO leaders summit Thursday, Anadolu Agency (AA) reported.

"I want to hand it over to the president of Ukraine, who has as much courage as he has determination. Ladies and gentlemen, President Putin," Biden said before quickly correcting himself.

"I'm so focused on beating Putin, we've gotta worry about it," he added.

The latest gaffe came amid ongoing discussions about Biden's mental health and his ability to serve another term, with calls for his withdrawal from the presidential race following his poor performance during the first presidential debate against Donald Trump in late June.

NATO leaders gathered for a three-day summit to mark the military alliance's 75th anniversary.

-- BERNAMA