In this Thursday, May 15, 2014 photo, China Coast Guard 3210 vessel sails in the waters claimed by China and Vietnam in the South China Sea. China's deployment of an oil rig off Vietnam's coast has prompted a tense sea standoff and touched off deadly anti-China rioting. The conflict pits two neighbors with very similar governments but whose people bear ill feelings rooted in a rivalry that dates back centuries and has occasionally burst out into armed conflict. (AP Photo/Hau Dinh)

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