Dublin, Ireland - Ukraine President Volodymyr Zelensky on Saturday brushed off US President Joe Biden's gaffe in which he mistakenly introduced him as Russian foe Vladimir Putin, saying "we can forget some mistakes."

As he began a visit to Ireland, Zelensky told reporters at Shannon Airport that "it's a mistake. I think United States gave a lot of support for Ukrainians. We can forget some mistakes, I think so."

Zelensky will meet Irish leader Simon Harris at the airport later Saturday, their first bilateral meeting on Irish soil.

Asked for his message to Ireland, Zelensky said: "First of all, thank you so much for your support, thanks to Ireland for hosting a lot of Ukrainian refugees, you were with us from the very beginning of the Russian invasion."

Donald Trump Trump inauguration fund raises record-shattering sum

Harris is expected to express Ireland's support for Ukraine's bid towards EU membership during the talks.

Zelensky is making the visit on his way back from Washington, where he attended a summit marking NATO's 75th anniversary.

It was at the summit that the 81-year-old Biden made the gaffe before quickly correcting himself.

"And now 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 as he announced a NATO-Ukraine compact.

Biden turned away from the lectern before coming back and exclaiming: "President Putin! He's going to beat President Putin. President Zelensky – I'm so focused on beating Putin we gotta worry about it. Anyway, Mr President."

Zelensky immediately quipped that he was "better" than Putin, but the incident intensified concerns about Biden's age and mental acuity.

Donald Trump Federal workers union hits back after Trump threatens remote work

Biden has insisted he is committed to running for another term in November.

The Zelensky mix-up wasn't his only blunder of the night, as Biden also referred to Vice President Kamala Harris as "Vice President Trump."