US fails to rally Southeast Asia on South China Sea ruling
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- United States joined 13 countries in a joint statement marking the 10th anniversary of the 2016 South China Sea ruling, reaffirming support for UNCLOS and freedom of navigation, but no Southeast Asian nations except the Philippines endorsed it.
- Philippines stood alone among Southeast Asian states in backing the U.S.-led statement, underscoring its alignment with Washington amid ongoing tensions with Beijing over maritime rights.
- Arbitral Tribunal at The Hague delivered a near-total victory to the Philippines in 2016 by invalidating China’s '9-dash line' claim and affirming Philippine sovereign rights, including traditional fishing access at Scarborough Shoal.
- China continues to reject the 2016 ruling and has advanced its maritime presence through reclamation and artificial island construction, actions the tribunal found to violate Philippine rights.
- Vietnam, despite its own dispute with China in the South China Sea, did not join the joint statement and instead issued a separate declaration reiterating its support for the ruling’s principles.
Why it matters: The U.S. faces diminishing diplomatic leverage in Southeast Asia as regional states prioritize economic ties with China over collective pushback, even on issues where their legal interests align. With only the Philippines joining the commemorative statement, Washington’s strategy of building a regional coalition lacks regional buy-in, weakening enforcement of international norms despite a clear legal precedent.
