A decade after an arbitral tribunal ruled on the South China Sea dispute between the Philippines and China, the award remains what a new anniversary analysis calls a cornerstone of sovereignty and international law.

The tribunal, constituted under Annex VII of the United Nations Convention on the Law of the Sea (UNCLOS), issued its award on 12 July 2016 in the case brought by the Philippines against the People's Republic of China. The ruling addressed the legality of China's expansive claims in the South China Sea, including the so-called nine-dash line, and the status of maritime features in the disputed waters.

The analysis, published by Eurasia Review to mark the tenth anniversary of the award, frames the decision as an enduring reference point in disputes over sovereignty and in the broader architecture of the international law of the sea.

What the Tribunal Decided

The Annex VII tribunal ruled overwhelmingly in favour of the Philippines. It held that China's claims to historic rights within the nine-dash line exceeded what UNCLOS permits and that, as a party to the Convention, China could not assert rights beyond the treaty's limits.

The tribunal also found that none of the disputed features in the Spratly Islands generates an entitlement to an exclusive economic zone, characterising them as rocks or, in some cases, low-tide elevations rather than fully entitled islands under Article 121 of UNCLOS.

China rejected the ruling from the outset. Beijing declined to participate in the proceedings, taking the position that the tribunal lacked jurisdiction, and has described the award as null and void. China has not complied with the decision. The Philippines, for its part, has consistently invoked the award as a legal foundation for its own positions in the South China Sea.

Why the Award Still Matters

The Eurasia Review analysis argues that, ten years on, the award has outlived the immediate confrontation that produced it. Its significance now lies in three areas.

First, the award clarified the legal status of maritime features under UNCLOS. Tribunals and commentators continue to cite its reasoning on what distinguishes an island from a rock and on the maritime zones each generates. That reasoning has shaped subsequent law-of-the-sea litigation, including later cases before the International Tribunal for the Law of the Sea and other Annex VII tribunals.

Second, the award affirmed that historic rights claims must yield to the UNCLOS framework. States that are party to the Convention cannot rely on asserted historic entitlements to override the treaty's allocation of maritime zones, the tribunal held. This holding constrains not only China but any state tempted to resurrect pre-Convention claims.

Third, the award tested the resilience of dispute resolution under Part XV of UNCLOS. China's non-participation and non-compliance posed, and still pose, the hardest question: what is an award worth when the losing state refuses to engage? The analysis treats the Philippines' continued reliance on the ruling, and the periodic diplomatic pressure it generates, as evidence that non-compliance has costs even without enforcement.

Practical Consequences for Practitioners

For lawyers advising governments and commercial actors in the region, the award remains the operative legal baseline. Any position on maritime entitlements, fisheries regulation, energy exploration or freedom-of-navigation operations in the South China Sea must now be assessed against the tribunal's findings on feature status and the invalidity of the nine-dash line claims. States invoking historic rights in the area face a decided precedent squarely against them. At the same time, practitioners must account for the enforcement gap: the award binds the parties as a matter of treaty law, but no mechanism exists to compel China's compliance, and a successor Philippine government that disavowed the ruling, as one briefly did in 2016, could complicate reliance on it. Advisers should therefore pair the award's legal holdings with a realistic political assessment of how counterparties treat it.

A Decade of Tension and Legal Contest

The tenth anniversary arrives amid continued friction. Philippine and Chinese vessels have repeatedly clashed near contested features, and the Philippines has increasingly invoked the award in diplomatic protests and public statements. Other states, including the United States, have referenced the ruling when pressing the case for freedom of navigation.

The Eurasia Review analysis concludes that the award's authority has grown rather than faded. Even its fiercest critics, the analysis suggests, must now argue against the ruling on legal grounds rather than pretend it does not exist.

For the international law community, the decade since 12 July 2016 has demonstrated both the strength and the limits of arbitral adjudication under UNCLOS: the tribunal spoke clearly, the winning party has held to the judgment, and the losing party's defiance has defined the contest that followed.