WASHINGTON—Facing an uncertain outcome in U.S. elections in November and no clear pathway to NATO membership for his country, Ukrainian President Volodymyr Zelensky appealed Tuesday in a speech at the beginning of the alliance summit to a traditional vision of U.S. leadership.

       He acknowledged that Ukraine’s future might be up for grabs in the coming U.S. presidential election in November. He steered clear of criticizing presumptive GOP nominee Donald Trump but did sound a note against U.S. isolationism, saying that if Ukraine is defeated, Western values will be defeated with it.

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