Foreign ministers from the 10-member Association of Southeast Asian Nations (ASEAN) failed to release a joint statement as scheduled on Saturday evening, and tense follow- up negotiations the next morning could still not end the stand-off, two diplomats involved in the talks told AFP.
China claims nearly all of the South China Sea, including waters approaching the coasts of ASEAN members Vietnam, the Philippines, Malaysia and Brunei.
The tense talks came after Vietnam, which also claims parts of the strategically vital sea, insisted that tough language be inserted into the statement expressing concern over Chinese land reclamation in the contested waters.
"Vietnam is adamant and China is effectively using Cambodia to champion its interests," one of the diplomats said.
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"But the Philippines is trying very hard to broker compromise language."
China has in recent years expanded its presence in the sea by building artificial islands, which are capable of holding military bases.
Tensions over the sea have long vexed ASEAN, which operates on a consensus basis but has had to balance the interests of rival claimants and those more aligned to China.
ASEAN and China were due to approve a framework for a code of conduct in Manila on Sunday on how to deal with sea dispute.
Analysts have cautioned not to place too much significance on the agreement on a framework.
They say it comes 15 years after negotiations on the issue first began, and China has used that time to cement its claims with the artificial islands, while an actual code likely remained many years away.
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