Cranes, structures and buildings are seen on China's man-made Subi Reef in the Spratlys chain of islands are seen from the Philippine-claimed Thitu Island off the disputed South China Sea in western Philippines Friday, April 21, 2017. Philippine Defense Secretray Delfin Lorenzana, Armed Forces Chief Gen. Eduardo Ano and other officials flew to the Thitu Island Friday to assert the country's claim to the heartland of the disputed area where China is believed to have added missiles on man-made islands. The South China Sea issue is expected to be discussed in the 20th ASEAN Summit of Leaders next week. (AP Photo/Bullit Marquez), APTOPIX