An oil rig (C) which China calls Haiyang Shiyou 981, and Vietnam refers to as Hai Duong 981, is seen in the South China Sea, off the shore of Vietnam in this May 14, 2014 file photo. REUTERS/Minh Nguyen/File Photo

An oil rig (C) which China calls Haiyang Shiyou 981, and Vietnam refers to as Hai Duong 981, is seen in the South China Sea, off the shore of Vietnam in this May 14, 2014 file photo. REUTERS/Minh Nguyen/File Photo

An oil rig (C) which China calls Haiyang Shiyou 981, and Vietnam refers to as Hai Duong 981, is seen in the South China Sea, off the shore of Vietnam in this May 14, 2014 file photo. REUTERS/Minh Nguyen/File Photo

August 11, 2016 8:09 AM (UTC+8)