FILE - In this April 10, 2018, file photo, a U.S. Navy crewman monitors on the deck of the U.S. aircraft carrier Theodore Roosevelt in international waters off South China Sea. The USS Theodore Roosevelt made the second-ever visit by a U.S. aircraft carrier strike group to Vietnam to mark 25 years of diplomatic relations and growing security ties between the former Cold War antagonists amid China's aggressive moves in the South China Sea. (AP Photo/Jim Gomez, File)
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