US Vice-President JD Vance, sitting nearby, also attacked Zelenskyy, calling him โdisrespectfulโ.
Zelenskyy appeared to try to speak but was cut off.
The extraordinary outburst came after Trump said Ukraine will have to make โcompromisesโ in a truce with Russia, which launched a full-scale invasion of its neighbour three years ago.
โYou canโt do any deals without compromises. So certainly heโs going to have to make some compromises, but hopefully they wonโt be as big as some people think,โ Trump said.
But showing Trump pictures of war atrocities and referring to President Vladimir Putin, Zelenskyy said there should be โno compromises with a killer on our territoryโ.
โCrazy Russians,โ he said, deported Ukrainian children and committed war crimes during their three-year invasion of his country.
Trump lashed out at Zelenskyy, who he said was โnot acting at all thankfulโ and not โniceโ.
โYouโre gambling with the lives of millions of people,โ Trump said. โYouโre gambling with World War Three, and what youโre doing is very disrespectful to the country โ this country.โ
The dramatic public breakdown in the long-tense relationship between Zelenskyy and Trump came after their meeting โ in front of a large group of journalists โ appeared to get off to a friendlier start.
Zelenskyy had said, โI think President Trump is on our sideโ.
He said that he would be speaking to the US President about the โcrucialโ need for a so-called US security โbackstopโ to any European deployments of peacekeepers monitoring an eventual truce.
โThis is crucial, this is what we want to speak about, this is very important,โ he said.
Trump has alarmed Kyiv and European allies with his abrupt U-turn in US policy, ending what had been full-throated support for Ukraineโs attempt to defeat the Russian invasion and casting himself as a mediator between Putin and Zelenskyy.
Trump said in the Oval Office that he had โspoken on numerous occasionsโ to Putin โ more than has been publicly reported beyond the lengthy call between the two leaders earlier this February.
Trump had told Zelenskyy that a truce is โfairly closeโ.
He also said a deal he was set to sign with Zelenskyy allowing US exploitation of Ukraineโs natural resources would be โvery fairโ.
The resources deal is intended to give the United States access to rare-earth and other critical minerals as part of an overall plan to help Ukraine recover after a truce.
Zelenskyy told Trump that he should visit his embattled nation. โYou have to come and to look.โ
– Agence France-Presse