Those fears spilled out on the stage of the Munich Security Conference on Saturday morning, when President Volodymyr Zelensky declared that “Ukraine will never accept deals made behind our backs.” He then called optimistically for the creation of an “army of Europe,” one that includes his now battle-hardened Ukrainian forces. He was advocating, in essence, a military alternative to NATO, a force that would make its own decisions without the influence — or the military control — of the United States.

Mr. Zelensky predicted that Mr. Putin would soon seek to manipulate Mr. Trump, speculating that the Russian leader would invite the new American president to the celebration of the 80th anniversary of the defeat of Nazi Germany. “Putin will try to get the U.S. president standing on Red Square on May 9 this year,” he told a jammed hall of European diplomats and defense and intelligence officials, “not as a respected leader but as a prop in his own performance.”

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