Biden Pledges Long-Term Backing for Ukraine, but a U.S. Election Looms

President Volodymyr Zelensky of Ukraine speaking at the NATO summit in Vilnius, Lithuania, on Wednesday. Mr. Zelensky said the summit had given Ukraine a “significant security victory.” Citing American politics, some NATO leaders expressed concern that Washington could waver in its support if there were a shift in power. Moments after President Biden assured Volodymyr Zelensky that he could count on United States support for as long as it took, the Ukrainian leader used the opportunity to speak not only to NATO allies but also to an audience thousands of...