US President Donald Trump will welcome Polish President Karol Nawrocki back to the White House on Wednesday.

Axar.az reports, citing Reuters, Trump extended the invitation days after Nawrocki was sworn in early in August and then intervened to ensure he joined a key telephone call on Ukraine with European leaders instead of his rival, centrist Polish Prime Minister Donald Tusk.

The president hosted Nawrocki at the White House in May, backing him at a crucial moment in the Polish election. Nawrocki went on to defeat the candidate of Tusk’s pro-European, centrist party a month later.

Wednesday’s talks are expected to center on stalled negotiations to end the war and Poland’s security concerns, amid signs that Trump has grown frustrated with Russian President Vladimir Putin for failing to move forward on ending the war.

On Tuesday, Trump said he was “very disappointed” in Putin, adding that his administration planned some action to bring down deaths in the war.

He will greet Nawrocki at the White House at 11 a.m. EDT (1500 GMT) with the two leaders to meet first in the Oval Office before a private lunch, the White House said. Poland, a member of NATO, borders both Russia and war-torn Ukraine.