NATO Secretary General Mark Rutte said Sunday that President Trump will be "testing" Russian President Vladimir Putin in their landmark face-to-face meeting set for Friday , as world leaders push for a ceasefire deal in Russia's war with Ukraine.

"On Friday, it is important to see how serious Putin is, and the only one who can do that is President Trump," Rutte said on "Face the Nation with Margaret Brennan."

Mr. Trump announced the "highly anticipated" summit with Putin in a post on Truth Social late last week, saying the leaders are set to meet Friday in Alaska.

The U.S. president had expressed frustration with Putin in recent weeks, as Russia pounded Ukraine with drone and missile attacks, including what Ukraine described as the largest such attacks since the invasion began in

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