Case briefing

On the tenth anniversary of the 2016 South China Sea arbitral award, a substantial coalition of states led by the Philippines and including the United States, Japan, Australia, Canada, several European states, New Zealand, and the United Kingdom publicly reaffirmed that the award is final, legally binding, and decisive on the maritime claims it addressed. The same statement reiterated that there is no legal basis for China’s expansive claims grounded in historic rights and opposed the use of coast guard, military, and maritime militia forces to intimidate lawful operations. The European Union issued a separate statement making the same core legal point and urging that disputes be managed under UNCLOS and eventually through an effective, substantive, and legally binding Code of Conduct. China answered immediately and unequivocally. Foreign Ministry spokesperson Lin Jian called the arbitration a political farce, said the award is illegal, null and void, and protested both the joint statement and the EU position.

The award’s legal status is settled. Its political force remains disputed. Supporters must decide whether repeated public backing can shape conduct when enforcement remains indirect and selective. Outside actors must also consider whether an anti-China bloc marker would narrow diplomatic room for ASEAN and other middle powers. The dispute turns on mechanism: whether legitimacy shapes behaviour through repetition and coalition signalling, or whether law needs hard balancing and sustained operational presence to influence conduct.

The next step will reveal whether supporters see public repetition as the main instrument, a foundation for practical incident management, leverage in Code of Conduct talks, or political cover for stronger maritime balancing. Each course protects a different part of the order and accepts a different risk.

Decision

How should supporters use the award after its tenth anniversary?

1. Broaden the law-first coalitionKeep public reaffirmation frequent and expand the group of states willing to cite the award as a living element of Indo-Pacific order.Tradeoff: Stronger legitimacy signalling, but greater Chinese backlash and a higher risk of bloc framing.
2. Shift from legal reaffirmation to incident-management mechanismsUse the award as background principle while prioritising coast guard hotlines, encounter rules, and fisheries protections.Tradeoff: Lower diplomatic heat, but weaker public defence of the legal precedent.
3. Link the award to Code of Conduct diplomacyTreat legal reaffirmation as leverage for a substantive and legally binding ASEAN-China Code of Conduct consistent with UNCLOS.Tradeoff: Potential institutional gain, with a risk that the code process could dilute the award instead of reinforcing it.
4. Treat the award as important but insufficient without balancingPair legal language with practical maritime capacity-building, presence, and coalition coordination. Legal repetition alone may not constrain behaviour.Tradeoff: More credible deterrence, but a greater chance of securitising what is partly a legitimacy dispute.

Known uncertainties

• Whether repeated legal reaffirmations by outside states materially change operational behaviour at sea.
• Whether more ASEAN states privately support the award than are willing to endorse it publicly.
• Whether China’s rejection remains rhetorical or is paired with a changed pattern of maritime operations in the coming months.
• Whether negotiations on a South China Sea Code of Conduct can remain legally meaningful while the parties disagree on the status of the award.

Source ledger

1. Joint Statement on the Tenth Anniversary of the Philippines-China South China Sea Arbitral Tribunal AwardMinistry of Foreign Affairs of Japanhttps://www.mofa.go.jp/press/release/pressite_000001_02511.html
2. Joint Statement on the Tenth Anniversary of the Philippines-China South China Sea Arbitral Tribunal AwardPhilippine Information Agencyhttps://pia.gov.ph/news/joint-statement-on-the-tenth-anniversary-of-the-philippines-china-south-china-sea-arbitral-tribunal-award/
3. South China Sea: Statement by the High Representative on behalf of the EU on the tenth anniversary of the Arbitral Award between the Philippines and ChinaCouncil of the European Unionhttps://www.consilium.europa.eu/en/press/press-releases/2026/07/11/south-china-sea-statement-by-the-high-representative-on-behalf-of-the-eu-on-the-tenth-anniversary-of-the-arbitral-award-between-the-philippines-and-china/
4. Foreign Ministry Spokesperson Lin Jian’s Regular Press Conference on July 14, 2026Embassy of the People's Republic of China in the United Stateshttps://us.china-embassy.gov.cn/eng/fyrth/202607/t20260714_11982116.htm
5. South China Sea Arbitration case filePermanent Court of Arbitrationhttps://pca-cpa.org/en/cases/7/