The Philippines’ recent presentation of its partial submission for an extended continental shelf in the West Philippine Sea has drawn attention from regional analysts and diplomatic observers. While the move is consistent with international law, some experts caution that it could complicate efforts to forge a unified ASEAN position on a code of conduct with China.

The Philippines has formally presented its case for an extended continental shelf (ECS) in the West Palawan Region before the United Nations Commission on the Limits of the Continental Shelf (CLCS), marking a significant milestone in the country’s 15-year effort to secure sovereign rights over thousands of square kilometers of seabed in the West Philippine Sea.

The reaffirmation comes as the 10th anniversary of the ruling drew international attention. On 12 July 2026, the Philippines and 13 partner countries issued a joint statement reaffirming the award as “final and binding” and saying there is no legal basis for China’s expansive maritime claims. Beijing responded by denouncing that statement and urging the countries to stop “spreading lies” about the arbitration.

MANILA, Philippines — The Philippines and 13 other countries have called on China to abide by the 2016 arbitral award on the West Philippine Sea, reaffirming that the ruling is “final, legally binding, and definitive” between the Philippines and China on the maritime claims covered by the tribunal.

On 12 July 2016, an arbitral tribunal constituted under Annex VII of the UN Convention on the Law of the Sea (UNCLOS) issued a landmark award in The Republic of the Philippines v. The People’s Republic of China. The tribunal held that China’s claims to historic rights within the “nine-dash line” had no lawful effect beyond entitlements available under UNCLOS, and it found multiple Chinese actions unlawful vis-à-vis the Philippines’ rights in its exclusive economic zone (EEZ).

The 12 July 2016 Award rendered by the Permanent Court of Arbitration in The Hague determined that China’s claims of historic rights within the South China Sea, as represented by its so-called nine-dash line, have no legal basis under international law.