The comments come as prominent Trump allies escalate pressure on Zelenskyy to dramatically change his approach to the U.S. president, who has made quickly ending the war a top priority, or step aside.

The long complicated relationship between the leaders has reached a nadir following a disastrous White House meeting in which Trump and Vice President JD Vance excoriated Zelenskyy for not being sufficiently thankful for U.S. support for Ukraine since Russian President Vladimir Putin ordered the February 2022 invasion.

“This is the worst statement that could have been made by Zelenskyy, and America will not put up with it for much longer!” Trump said in a post on his Truth Social platform about the comments Zelenskyy made late Sunday while speaking to reporters in London.

Trump at an event at the White House later on Monday referred to Zelenskyy’s reported comments, and asserted the Ukrainian leader “better not be right about that.”

“If somebody doesn’t want to make a deal, I think that person won’t be around very long,” Trump added. “That person will not be listened to very long.”

Trump took issue with Zelenskyy suggesting it would take time to come to an agreement to end the war. The Ukrainian leader also tried to offer a positive take on the U.S.-Ukraine relationship in the aftermath of last week’s White House meeting.

Asked by a reporter about the outlines of a new European initiative to end Russia’s war, Zelenskyy said: “We are talking about the first steps today, and, therefore, until they are on paper, I would not like to talk about them in great detail.”

“An agreement to end the war is still very, very far away, and no one has started all these steps yet,” he added.

But Trump was only further irritated by Zelenskyy’s suggesting it will take time for the conflict to come to a close.

“It is what I was saying, this guy doesn’t want there to be Peace as long as he has America’s backing and, Europe, in the meeting they had with Zelenskyy, stated flatly that they cannot do the job without the U.S. — Probably not a great statement to have been made in terms of a show of strength against Russia,” Trump added in his post. “What are they thinking?”

Zelenskyy took to social media soon after Trump’s latest criticism. He did not directly refer to Trump’s comments, but underscored that it “is very important that we try to make our diplomacy really substantive to end this war the soonest possible.”

“We need real peace and Ukrainians want it most because the war ruins our cities and towns,” Zelenskyy added. “We lose our people. We need to stop the war and to guarantee security.”

Trump’s national security adviser said Zelenskyy’s posture during Friday’s Oval Office talks “put up in the air” whether he’s someone the U.S. administration will be able to deal with going forward.

“Is he ready, personally, politically, to move his country towards an end to the fighting?” Mike Waltz said on Fox News’ “America’s Newsroom” earlier Monday. “And can he and will he make the compromises necessary?”

Waltz added another layer of doubt about U.S. support as other high-profile Trump allies have suggested that the relationship between Trump and Zelenskyy is becoming untenable.

House Speaker Mike Johnson said Sunday that Zelenskyy “needs to come to his senses and come back to the table in gratitude or someone else needs to lead the country” for Ukraine to continue pursuing a peace deal negotiated by the United States.

Sen. Lindsey Graham, a Trump ally who has been a vociferous supporter of Ukraine, said soon after the Oval Office meeting that Zelenskyy “either needs to resign and send somebody over that we can do business with, or he needs to change.”

Angela Stent, a former national intelligence officer for Russia and Eurasia at the National Intelligence Council, said Putin is likely in no rush to end the war amid the fissures between Trump and Zelenskyy and Europe and the U.S. about the way ahead.

“He is not interested in ending the war,” said Stent, a senior fellow at the Brookings Institution in Washington. “He thinks Russia is winning. … And he thinks that as time goes on, the West will be more fractured.”

Trump administration and Ukrainian officials had been expected to sign off on a deal during Zelenskyy’s visit last week that would have given the U.S. access to Ukraine’s critical minerals in part to pay back more than $180 billion in aid the U.S. has sent Kyiv since the start of the war. The White House has also billed such a pact as a way to tighten U.S.-Ukrainian relations in the long term.

The signing was scrapped after the leaders’ Oval Office talks went off the rails and White House officials asked Zelenskyy and the Ukrainian delegation to leave.

Trump on Monday, however, suggested he hasn’t given up on the economic pact, calling it “a great deal.” He added that he expected to speak to the deal during his Tuesday address before a joint session of Congress.