However, Beijing insists on outside countries being excluded in what analysts said was a bid to diminish USA influence, AFP reports.
China and Asean this week announced they had agreed on a draft negotiating text as part of efforts to forge a code of conduct to govern behaviour in the South China Sea.
Cayetano spoke in Singapore with Iranian Foreign Minister Mohammad Javad Zarif on the sidelines of the Association of Southeast Asian Nations (ASEAN) foreign ministers' meeting.
ASEAN, having "achieved its initial political objective of regional peace and stability", has "shifted its focus to economic cooperation", Lee said.
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But many experts say those are neither irrevocable nor serious steps that could show the country is honest about denuclearization. There were estimated 5,300 Americans who did not return home from the conflict.
Asean has also engaged external parties, starting post-ministerial conferences with its dialogue partners in 1978, the Asean Regional Forum in 1994, the Asean Plus Three in 1997, and the East Asia Summit in 2005.
The decision of the Philippine government to go into a joint exploration of natural resources with China in the West Philippine Sea (WPS) signed away Philippine sovereignty in the contested area.
However, it was too early to say when negotiations would be complete, he added.
Singapore's navy hosted the computer-simulated drills at a training center at Changi naval base.
Thailand, one of Washington's oldest allies, is another major regional power perceived to have moved closer to China after USA relations came under strain because of concerns about freedoms under its military-dominated government.
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The higher amount matches what Trump has privately sought in conversations with Republican lawmakers. Provost, acting chief of the USA border patrol told members of the Senate Judiciary Committee.
"We are pleased with our rapidly growing institutional relationship with ASEAN and its member states", he said.
Asean-related meetings to be held in Singapore through Saturday will include foreign ministers not just from Asean but such countries as Australia, Canada, China, India, Japan, New Zealand, Russia, the U.S. and the two Koreas.
Since President Donald Trump met North Korean leader Kim Jong Un in June, U.S. officials have been optimistic that Pyongyang will give up its nuclear weapons, though there is no evidence the North has begun that process.
In veiled criticism of China's militarization of disputed features in the South China Sea, the ministers emphasized the importance of "non-militarization and self-restraint" in the conduct of all activities in the disputed waters.
Australian Minister for Foreign Affairs Julie Bishop said ASEAN holds a leading role in Southeast Asia and a strong connection in the Indo-Pacific region, adding that the power of the bloc's solidarity will help maintain peace and security and create other growth pushes.
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Fruits, nuts, rice, legumes, beef, pork and milk could be purchased for distribution to food-aid programs. The tweet came ahead of his Wednesday meeting with European Commission President Jean-Claude Juncker.
However, opposition has weakened in other parts of Southeast Asia, with analysts saying that countries are keen to attract Chinese investment and are anxious about USA commitment to the region under President Donald Trump.