European Leaders Try to Recalibrate After Trump Sides With Russia on Ukraine

President Emmanuel Macron of France called a second emergency meeting of European allies on Wednesday seeking to recalibrate relations with the United States as President Trump upends international politics by rapidly changing American alliances.

Mr. Macron had already assembled a dozen European leaders in Paris on Monday after Mr. Trump and his new team angered and confused America’s traditional allies by suggesting that the United States would rapidly retreat from its security role in Europe and planned to proceed with peace talks with Russia — without Europe or Ukraine at the table.

Mr. Trump’s remarks late on Tuesday, when he sided fully with Russia’s narrative blaming Ukraine for the war, have now fortified the impression that the United States is prepared to abandon its role as a European ally and switch sides to embrace President Vladimir V. Putin of Russia.

It was a complete reversal of historic alliances that left many in Europe stunned and fearful.

“What’s happening is very bad. It’s a reversal of the state of the world since 1945,” Jean- Yves Le Drian, a former French foreign minister, said on French radio Wednesday morning.

“It’s our security he’s putting at risk,” he said, referring to President Trump. “We must wake up.”

Fear that Mr. Trump is ready to abandon Ukraine and has accepted Russian talking points has been particularly acute in Eastern and Central Europe, where memories are long and bitter of the West’s efforts to appease Hitler in Munich in 1938 and its assent to Stalin’s demands at the Yalta Conference in 1945 for a Europe cleaved in two.

“Even Poland’s betrayal in Yalta lasted longer than Ukraine’s betrayal in Riyadh,” Jaroslaw Walesa, a Polish lawmaker and the son of Poland’s anti-Communist Solidarity trade union leader, Lech Walesa, said Wednesday on social media, referring to the American-Russian talks in Saudi Arabia on Tuesday.