Since President Trump returned to the White House this year, President Volodymyr Zelensky of Ukraine has stuck to one rule: Never miss a chance to meet with the U.S. leader to try to pull him into Kyiv’s corner.

On Tuesday, he will have his latest opportunity. Mr. Zelensky will meet with Mr. Trump on the sidelines of the United Nations General Assembly in New York, Karoline Leavitt, the White House press secretary, told reporters on Monday.

For Mr. Zelensky, a sit-down with Mr. Trump could deliver more results than his speech to the General Assembly, a forum where Russia’s full-scale invasion of Ukraine has gradually slipped down the agenda after more than three years of war. This year, debates are set to be dominated by other topics, including the wars in Gaza and Sudan.

The last time the two leaders met, at the White House last month, Mr. Zelensky came away with a win. He secured a U.S. commitment to participate in security guarantees for Ukraine as part of a peace deal aimed at deterring future Russian attacks.

Since then, Ukraine and its European allies have been working on drafting the specifics of those guarantees, but America’s exact role in that arrangement remains uncertain.

Mr. Trump has said Washington may provide air support to European troops stationed in Ukraine in a postwar settlement, without releasing specifics. Analysts say the absence of clarity has kept Kyiv and its European partners from publicly announcing the guarantees or moving forward with the next stage of peace talks with Russia.