President Trump told Ukrainian President Volodymyr Zelensky that he was “gambling with World War III” during a fiery Oval Office exchange Friday — before canceling a press conference and declaring that the wartime leader was “not ready for peace.”

The high-stakes visit went off the rails shortly after Vice President JD Vance leaned into Zelensky for seeming to slight his American counterparts.

Vance said it was “disrespectful for Zelensky to come into the Oval Office, litigating in front of the American media,” according to a pool report.

Trump then raised his voice, telling Zelensky, “you’re not really in a good position right now.”

“You’re gambling with WWIII,” the American president said.

Trump and Zelensky had been scheduled to give a joint press conference at 1 p.m. following the signing of a framework mineral agreement, but was cancelled after the shouting match erupted between Trump, Zelensky, and Vice President JD Vance.