In an explosive public confrontation unlike any in recent history, President Trump and Vice President JD Vance berated Ukraine’s president, Volodymyr Zelensky, in the Oval Office today. The leaders accused Zelensky of not being grateful enough for U.S. support in its war with Russia — “just say thank you,” Vance said — and sought to strong-arm him into a peace deal on whatever terms the Americans dictated.

“You’re either going to make a deal or we’re out,” Trump told Zelensky. “And if we’re out, you’ll fight it out, and I don’t think it’s going to be pretty.”

The shouting match, which was televised, ultimately eroded plans for a rare minerals deal between the two countries and cut short a visit meant to coordinate a plan for peace. (Watch the fiery exchange.)

“Never has an American president lectured the leader of an ally in public like this, much less the leader of a country that is fighting off invaders,” said Peter Baker, our chief White House correspondent.

The confrontation left the U.S.-Ukraine relationship in turmoil and provided a boost to Vladimir Putin, who has long sought to drive a wedge between Ukraine and its most important patron.

“I have determined that President Zelenskyy is not ready for Peace if America is involved, because he feels our involvement gives him a big advantage in negotiations,” Trump wrote afterward on social media. “He disrespected the United States of America in its cherished Oval Office. He can come back when he is ready for Peace.”