In this July 16, 2018, file photo, U.S. President Donald Trump, left, and Russian President Vladimir Putin shake hands at the beginning of a meeting at the Presidential Palace in Helsinki, Finland. When Trump and Putin meet this week on the sidelines of an international summit in Japan, it will mark a new chapter in a closely watched relationship that crackles with questions and contradictions. (AP Photo/Pablo Martinez Monsivais, File)
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