China Marine Surveillance ship Haijian 83 sets off from Sanya harbor of south China's Hainan Province, March 8, 2013. A fleet of three marine surveillance ships were on a patrol mission to perform regular sea patrols and law-enforcement operations in south China's Xisha. [Xinhua/Wei Hua]

China Marine Surveillance ship Haijian 83 sets off from Sanya harbor of south China's Hainan Province, March 8, 2013. A fleet of three marine surveillance ships were on a patrol mission to perform regular sea patrols and law-enforcement operations in south China's Xisha. [Xinhua/Wei Hua]