Ahead of the launch of the annual gathering of foreign ministers from the 10-member Association of Southeast Asian Nations (ASEAN), Vietnam made a bold play against China with a raft of suggested changes to a planned joint communique.
It set the stage for a fiery few days of diplomacy in the Philippine capital, with the top diplomats from China, the US, Russia and North Korea to join their ASEAN and other Asia- Pacific counterparts for security talks from tomorrow.
The United States said it would also seek to build unified pressure on the North at the Manila event -- known as the ASEAN Regional Forum.
After their own day of meetings today, ASEAN foreign ministers released a joint statement expressing "grave concerns" over the North's first two intercontinental ballistic missile tests that were conducted last month.
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"These developments seriously threaten peace, security and stability in the region and the world," the statement said.
Vietnam last night sought to insert tough language against China in an ASEAN statement that was scheduled to be released after the Southeast Asian ministers wrapped up their own talks today.
According to a copy of a draft obtained by AFP, Vietnam lobbied for ASEAN to express serious concern over "construction" in the sea, in reference to China's ramped up building of artificial islands in the disputed waters in recent years.
The lobbying occurred when the ASEAN foreign ministers held unscheduled and informal talks late last night.
"The discussions were really hard. Vietnam is on its own to have stronger language on the South China Sea. Cambodia and Philippines are not keen to reflect that," one diplomat involved in the talks told AFP.
China claims nearly all of the strategically vital sea, including waters approaching the coasts of Vietnam, the Philippines, Malaysia and Brunei.
China has in recent years expanded its presence in the sea by building the artificial islands, which are capable of holding military bases.
But, under President Rodrigo Duterte, the Philippines has sought to downplay the dispute with China in return for billions of dollars in Chinese investments and aid.
China has in recent years also successfully lobbied other ASEAN nations, particularly Cambodia, to support its diplomatic manoeuvring in the dispute.
Various diplomats said that Vietnam was likely to lose its battle to insert the strong language against China, with the Philippines as host of the talks wielding greater influence.
ASEAN is set to this weekend adopt a framework for a code of conduct with China, which is meant to pave the way for more concrete action.
Another pressing issue in Manila will be the growing terrorism threat in the region.
The event is taking place as Philippine security forces battle Islamic State-aligned gunmen who have since May been occupying parts of Marawi, the nation's main Muslim city about 800 kilometres to the south of Manila.
US Secretary of State Rex Tillerson is also set to meet Duterte on the sidelines of the event, with those talks expected to cover the Philippine president's controversial drug war that has claimed thousands of lives.
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