FILE - In this Friday, April 21, 2017, file photo, Philippine Defense Secretary Delfin Lorenzana tours the Philippine-claimed island of Pag-asa, also known as Thitu, during his visit to the Spratlys chain of islands in the disputed South China Sea. Lorenzana and Armed Forces Chief Gen. Eduardo Ano flew to the island in the South China Sea, drawing a protest from China, which also claims the remote territory. (AP Photo/Bullit Marquez, File)
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