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A man wears a shirt reading "Rope. Tree. Journalist." as supporters gather to rally with Republican presidential nominee Donald Trump in a cargo hangar at Minneapolis Saint Paul International Airport in Minneapolis, Minnesota, November 6, 2016. REUTERS/Jonathan Ernst
WASHINGTON/MOSCOW (Reuters) -U.S. President Joe Biden called on Russian President Vladimir Putin on Tuesday to reduce tensions stirred by a Russian military build-up on Ukraine's border and proposed a summit of the estranged leaders to tackle a raft of disputes.