China and Vietnam are at odds over the South China Sea . Six countries claim the sea in whole or in part . Beijing ( CNN ) -- The United States says it is neutral but has offered to mediate . China rejects foreign intervention , but Vietnam has supported it .
China and Vietnam are at odds over the South China Sea . Six countries claim the sea in whole or in part . The United States says it is neutral but has offered to mediate . China rejects foreign intervention , but Vietnam has supported it .