BRUSSELS — The war in Ukraine and the existential threat that Russia poses to European security has dominated NATO’s agenda in each of the summits the military alliance has held since Moscow launched its invasion in 2022.

President Volodymyr Zelenskyy has sat at the head of NATO’s table and been uniformly praised for his leadership. Ukraine’s place within the ranks of the world’s biggest military organization seemed assured once the war was over.

But three weeks before U.S. President Donald Trump and his NATO counterparts gather in the Netherlands, it remained unclear whether Zelenskyy would even get a seat, or how much support Ukraine might win in the final summit communique.

Asked on Wednesday about Ukraine’s role at the top-level meeting on June 24-25 in The Hague, NATO Secretary-Gen

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