Philippines, US, Japan Conduct Multilateral Naval Drills West Philippine Sea

The Philippines, United States, and Japan recently concluded the 11th Multilateral Maritime Cooperative Activity in the West Philippine Sea, reinforcing their defense cooperation amid rising tensions with China over contested waters. Philippine forces deployed assets including the BRP Jose Rizal and fighter jets, while the U.S. and Japan contributed warships and aircraft to demonstrate amphibious and combined maritime operations. During the drills, the Philippine Navy issued a formal radio challenge to a Chinese warship operating within the Philippines’ exclusive economic zone, which China disputed, citing sovereign immunity. These exercises underscore the three nations’ commitment to maritime cooperation, regional security, and upholding a rules-based international order in the Indo-Pacific. The drills followed China's announcement to establish a marine reserve in Scarborough Shoal, prompting a diplomatic protest from the Philippines. Such joint military activities aim to enhance interoperability and affirm the Philippines’ resolve to defend its maritime entitlements under international law.