China publicly thanked Cambodia for supporting its stance on maritime disputes, a position which threw the regional block's weekend meeting in the Laos capital of Vientiane into disarray.

Competing claims with China in the vital shipping lane are among the most contentious issues for the Association of Southeast Asian Nations, with its 10 members pulled between their desire to assert their sovereignty while finding common ground and fostering ties with Beijing.

In a ruling by the UN-backed Permanent Court of Arbitration on July 12, the Philippines won an emphatic legal victory over China on the dispute.

The Philippines and Vietnam both wanted the ruling, which denied China's sweeping claims in the strategic seaway that channels more than $5 trillion in global trade each year, and a call to respect international maritime law to feature in the communique.

Backing China's call for bilateral discussions, Cambodia opposed the wording on the ruling, diplomats said.

Manila agreed to drop the reference to the ruling in the communique, one ASEAN diplomat said on Monday, in an effort to prevent the disagreement leading to the group failing to issue a statement.

The communique referred instead to the need to find peaceful resolutions to disputes in the South China Sea in accordance with international law, including the United Nations' law of the sea, to which the court ruling referred.

"We remain seriously concerned about recent and ongoing developments and took note of the concerns expressed by some ministers on the land reclamations and escalation of activities in the area, which have eroded trust and confidence, increased tensions and may undermine peace, security and stability in the region," the ASEAN communique said.

In a separate statement, China and ASEAN reaffirmed a commitment to freedom of navigation and overflight in the South China Sea and said they would refrain from activities that would complicate or escalate disputes. That included inhabiting any presently uninhabited islands or reefs, it added.

China's Foreign Minister Wang Yi said a page had been turned after the "deeply flawed" ruling and it was time to lower the temperature in the dispute.

"It seems like certain countries from outside the region have got all worked up keeping the fever high," Wang told reporters.

China frequently blames the United States for raising tensions in the region and has warned regional rival Japan to steer clear of the dispute.

MAJOR POWERS ARRIVE

The United States, allied with the Philippines and cultivating closer relations with Vietnam, has called on China to respect the court's ruling.

It has criticized China's building of artificial islands and facilities in the sea and has sailed warships close to the disputed territory to assert freedom of navigation rights.

Meeting US National Security Adviser Susan Rice in Beijing, Chinese State Councillor Yang Jiechi said both countries need to make concerted efforts to ensure stable and good relations between the two major powers.

"So far this year, relations between China and the United States have generally been stable, maintaining coordination and cooperation on bilateral, regional and international level. Meanwhile, both sides face challenging differences that need to be carefully handled," said Yang, who outranks the foreign minister.

US Secretary of State John Kerry arrived in Laos' capital on Monday for the ASEAN regional forum and East Asia summits. He is expected to discuss maritime issues in a meeting with Wang, as well as in meetings with ASEAN members.

Kerry will urge ASEAN nations to explore diplomatic ways to ease tension over Asia's biggest potential military flashpoint, a senior US official said ahead of his trip.

