Chinese dredging vessels are purportedly seen in the waters around Mischief Reef in the disputed Spratly Islands in the South China Sea, in this file still image from video taken by a P-8A Poseidon surveillance aircraft and provided by the United States Navy on May 21, 2015. Japan will join a major U.S.-Australian military exercise for the first time in a sign of growing security links between the three countries as tensions fester over China’s island building in the South China Sea. REUTERS/U.S. Navy/Handout via Reuters/Files
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