The new contingent of Filipino marines replaced troops at the Second Thomas Shoal, where the arrival last month of Chinese ships sparked diplomatic protests from the Philippines.
Defense Secretary Voltaire Gazmin said that the shoal lies within the Philippines' internationally recognized 370-kilometre exclusive economic zone. China claims almost the entire South China Sea as its own and last year took control of another shoal in the Philippines' economic zone, prompting Manila to seek UN arbitration.
Gazmin said he had discussed the fresh Philippine deployment with Chinese Ambassador Ma Keqing recently. Ma raised concerns that the Philippines was planning to erect concrete structures at the shoal to reinforce its territorial claim, but Gazmin said he had assured her there was no such plan.
Gazmin said that he discussed the issue with Ma to prevent a possible confrontation between Chinese and Filipino forces, but stressed that the Philippines was free to undertake any activity in the shoal without notifying China. "It's ours," Gazmin said by telephone.
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"They're really concerned and want to be sure that this will be resolved without use of force," Gazmin said.
The Second Thomas Shoal lies near the Spratlys, a chain of resource-rich islands, islets and reefs contested by China along with Brunei, Malaysia, the Philippines, Taiwan and Vietnam. China and the Philippines figured in a months-long standoff over another territory, the Scarborough Shoal, which lies north of the Spratlys in April last year. Philippine ships later backed off from Scarbrough, giving China effective control of the shoal.