The event marks the first time China has hosted such a meeting and takes place as expectations grow that the US Navy will directly challenge Beijing's claims to the South China Sea. Four of the ASEAN nations exercise claims to seas and islands in the South China Sea that clash with Beijing's own.
The informal meeting will be followed by the Xiangshan Forum, at which analysts, military leaders and others from around the globe will discuss Asian-Pacific security, maritime issues and anti-terrorism.
Unnamed Pentagon officials said last week that the US Navy may soon receive approval to sail a ship inside the 21-kilometre territorial limit surrounding China's man-made islands, reported the Navy Times, which is closely affiliated with the US Navy. ASEAN member Philippines expressed support for such a move.
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The US and its allies, including the Philippines, say the newly made islands threaten stability in an increasingly militarised region.
Chinese Foreign Ministry spokeswoman Hua Chunying said Wednesday the artificial islands were created for the public good and have "nothing to do" with militarisation.
China has also sparred with Vietnam, another ASEAN member, over ownership of the Paracel island group, leading to a confrontation last year when Beijing moved a massive oil drilling platform into contested waters.
China's Defence Ministry has said that the ASEAN gathering in Beijing is to "promote strategic trust and pragmatic cooperation." Chinese Defence Minister Gen. Chang Wanquan will hold talks with his counterparts, the spokesman said.