White House talks between President Donald Trump, Ukrainian President Volodymyr Zelensky, and major European leaders went well on Monday. The president must now translate positive rhetoric into verifiable progress toward peace in Ukraine.

His diplomatic agenda is a noble one. Russian President Vladimir Putin began this war, the bloodiest and biggest in Europe since 1945, more than 3 1/2 years ago. He launched an unprovoked invasion that has now killed hundreds of thousands of men, women, and children. Trump’s meeting with Putin in Alaska last Friday generated uncertain results, but discussions on Monday advanced at least two points of opportunity.

First, Trump emphasized his openness to direct U.S. support for Western security guarantees for Ukraine. This is new. Such guarantees would ta

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