The government, however, said the issue was quickly resolved amid the Asian neighbours' friendlier ties.
Two senior Philippine security officials told The Associated Press that three Chinese navy ships, a coast guard vessel and 10 fishing boats began keeping watch on Sandy Cay on Aug. 12 after a group of Filipino fishermen were spotted on the sandbars. The Filipinos eventually left but the Chinese stayed on.
A senior Philippine diplomat, who also spoke on condition of anonymity because of a lack of authority to discuss the issue publicly, said China "is concerned that we will build" structures on the sandbars. Chinese and Philippine officials have quietly worked to resolve the issue in recent days, said the diplomat, who is involved in the talks.
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On August 15, a blue Chinese helicopter flew low off Thitu's southwest coast, the report said.
Philippine troops and villagers based at Thitu call it Pag-asa, Tagalog for hope, while the Chinese call the island Zhongye Dao.
The Chinese military presence near Thitu sparked concerns in Manila.
Philippine Supreme Court Senior Associate Justice Antonio Carpio, who has studied the disputes extensively, said the Chinese navy ships and other vessels encroached in the Philippine island's 22-kilometre territorial waters.
He said President Rodrigo Duterte and Foreign Secretary Alan Peter Cayetano have the constitutional duty to defend and protect Philippine territory.
"The very least that they could do now is to vigorously protest this invasion of Philippine territory by China," Carpio said. "If both are courageous, they should send a Philippine navy ship to guard Sandy Cay and if the Chinese navy ships attack the Philippine navy vessel, they should invoke the Philippine-US Mutual Defense Treaty."
Cayetano, however, told reporters today that the issue has been diplomatically resolved and denied that China has invaded Sandy Cay.
"Let me assure you, there is no more problem in that area," Cayetano told reporters, declining to provide details. "But it is not true that there was an attempt to invade or seize it."
In Beijing, Chinese foreign ministry spokeswoman Hua Chunying said people with ulterior motives were seeking to "stir up conflicts between China and the Philippines."
She offered no further details on China's activities in the area. "What I want to stress is that China has been committed to resolving relevant disputes peacefully through negotiation and consultation with the sovereign states directly concerned," Hua said.
Despite such tact, Finance Secretary Sonny Dominguez said the Duterte administration would never trade the national interest for economic concessions.
"If our relationship with our neighbours isn't this good, the situation in the West Philippine Sea will be much, much worse," Cayetano said, using the Philippine name for the South China Sea.
Duterte told reporters over dinner yesterday that he has been assured by China's ambassador in Manila, Zhao Jianhua, and the Chinese foreign ministry that Beijing has no plans to occupy or build structures on Sandy Cay.
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