FILE - In this April 21, 2017, file photo, Chinese structures and an airstrip on the man-made Subi Reef at the Spratly group of islands in the South China Sea are seen from a Philippine Air Force C-130. China on Friday, May 19, 2017, said it reached agreement with the 10 countries of the Association of Southeast Asia Nations (ASEAN) on the rough outline of a legally binding code of conduct designed to prevent clashes in the strategic South China Sea. (Francis Malasig/Pool Photo via AP, File)