The incident between the two vessels in the South China Sea on Sunday left the Vietnamese unit “severely damaged”, according to national broadcaster China National Radio.

China National Offshore Oil Corporation (CNOOC) earlier this month moved its semi-submersible rig Hai Yang Shi You 981 into an area near the Paracel Islands - or Xisha Islands as China calls them - in a disputed area of the South China Sea, prompting outrage from the Vietnam government.

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