Japan, the Philippines, and the US conduct a Multilateral Maritime Cooperative Activity in the South China Sea

On 13 September 2025, the Japan Maritime Self-Defense Force (JMSDF) JS OSUMI (LST-4001) conducted a Multilateral Maritime Cooperative Activity (MCA) in the South China Sea, together with the Philippine Navy and the US Navy.
 
Japan, the Philippines, and the United States, as maritime partners, remain steadfast in their commitment to advancing the vision of a Free and Open Indo-Pacific (FOIP). Through this MCA, the three nations aim to promote regional stability and maritime security in accordance with international law, including the United Nations Convention on the Law of the Sea (UNCLOS).
 
The three countries reaffirmed their unwavering partnership in the region and will continue to work in close coordination to uphold lasting peace, prosperity, and security throughout the region.