FILE - In this April 21, 2017, file photo, Chinese structures and buildings on the man-made Subi Reef at the Spratlys group of islands are seen from the Thitu Island off the South China Sea. The Philippines has expressed concern to China over an increasing number of Chinese radio messages warning Philippine aircraft and ships to stay away from newly fortified islands and other territories in the South China Sea claimed by both countries, officials said Monday, July 30, 2018. (AP Photo/Bullit Marquez, File)
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