The statement by Philippine Foreign Secretary Albert Del Rosario ensured that the growing row over rival claims to the strategically vital and potentially resource-rich sea would again be a key focus of the annual four-day Asia-Pacific talks.
"Del Rosario today expressed serious concern over the increasing militarisation of the South China Sea," said a Philippine government statement released on the first day of the event in the Brunei capital.
Del Rosario described the Chinese presence at these islets as "threats to efforts to maintain maritime peace and stability in the region".
He did not give details of the alleged buildup but said the Chinese actions violated a pact in 2002 in which rival claimants to the sea pledged not to take any actions that may increase tensions.
The declaration on conduct signed by the 10-member Association of Southeast Asian Nations (ASEAN) and China also committed claimants to settle their disputes "without resorting to the threat or use of force".
ASEAN members the Philippines, Vietnam, Brunei and Malaysia, as well as Taiwan, also have competing claims to parts of the sea.
The rivalries have for decades been a source of regional tension, with China and Vietnam fighting battles in 1974 and 1988 for control of some islands in which dozens of Vietnamese soldiers died.
Tensions have again grown in recent years with the Philippines, Vietnam and some other countries expressing concern at increasingly assertive Chinese military and diplomatic tactics to stress control of the sea.
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