Polish Prime Minister Donald Tusk has voiced his scepticism about selecting the Hungarian capital as a site for a possible trilateral meeting involving the presidents of the US, Russia and Ukraine to discuss the next steps in negotiating an end to the war.

Russian foreign minister Sergei Lavrov has accused European leaders of trying to undermine progress which he said had been made at last week's U.S.-Russia summit in Alaska on a possible peace deal in Ukraine.

The forint strengthened, and interest in Hungarian bank bonds increased following leaks of Budapest being potential venue for peace talks ending war in Ukraine.

The Ukrainian leader returned with a U.S. commitment to participate in security guarantees for Kyiv in a postwar settlement.