WASHINGTON —

During their second meeting in the Oval Office this year , President Donald Trump said the U.S. would be willing to support European efforts to police any peace deal in Ukraine, while its leader, Volodymyr Zelenskyy expressed his gratitude and wore dressier clothes.

As Trump hosted Zelenskyy and top European leaders to energize months of stalled U.S.-led efforts to halt Russia's 3 1/2-year-old war, the tone and style of the sit-down was far different than when Ukraine's president was hounded out of the White House in February.

Following the talks, Trump called and spoke at length to Russian President Vladimir Putin who got the red carpet treatment at a summit with Trump last Friday in Alaska , to discuss the extraordinary gathering of allies. Trump said he would n

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