The Philippines has protested past attempts by Chinese coast guard ships to block smaller boats transporting fresh military personnel, food and other supplies to a Filipino military ship outpost at the disputed Second Thomas Shoal, which is also being claimed and guarded by Chinese coast guard ships. The tense standoff at the shoal has lasted two years.
AP journalists witnessing a resupply mission last year saw a US military plane hovering above a Filipino supply boat, which a Chinese coast guard ship tried but failed to block.
Such US military flights deter Chinese moves, Gazmin said, adding that Philippine resupply boats have been harassed less by Chinese coast guard ships after the deployment of the US patrol plane.
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Second Thomas Shoal, which is called Ayungin by Filipinos and Ren'ai by the Chinese, and the nearby Spratly Islands lie about 190 kilometers from the western Philippine province of Palawan, and about 1,000 kilometers from southern China.
China's foreign ministry says Beijing has "indisputable sovereignty" over the shoal.
The Philippine navy deliberately ran one of its ships aground at the shoal in 1999, fearing that Chinese forces would occupy it after taking control of nearby Mischief Reef four years earlier. A Chinese frigate and maritime surveillance ships arrived in 2013 and the uneasy standoff remains unresolved.