There is almost no aspect of European policy that Mr. Trump does not seem poised to upend. He is threatening to impose sweeping tariffs and is pressing for much heftier European spending on defense. Two of his first acts as president were to withdraw from the Paris climate agreements and the World Health Organization.

How he will adjust America’s stance toward Ukraine is one of the biggest questions: During his campaign, he pledged to end the war on his first day in office, though that timeline has crept back and he has not said how.

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