China Singles Out Japan Over South China Sea Tribunal Statement

Fourteen countries marked ten years since the Philippines–China arbitral award by calling it final and binding. Beijing rejected the declaration—and reserved an unusually detailed attack for Japan, invoking wartime occupation, Okinotorishima and Tokyo’s growing military partnership with Manila.

What happened

On July 12, Japan, the Philippines, the United States and eleven other countries issued a joint statement commemorating the tenth anniversary of the 2016 South China Sea award. The signatories said the decision was final, legally binding and definitive between China and the Philippines on the maritime claims it addressed. They repeated the tribunal’s conclusion that China had no legal basis for expansive “historic rights” beyond the entitlements allowed by the UN Convention on the Law of the Sea, or UNCLOS.

The statement also opposed coercive conduct by coast guards, militaries and maritime militias. Japan’s Foreign Minister Toshimitsu Motegi issued a separate declaration, calling China’s refusal to accept the award a challenge to the rule of law and linking Japan’s diplomatic position to assistance for the Philippines.

China answered twice. One response rejected the fourteen-country statement and blamed outside powers for militarization. A second, Japan-specific response said Tokyo was not a party to the South China Sea disputes, accused it of reviving militarism and highlighted what Beijing presented as a contradiction: Japan supports the ruling that Taiping Island is legally a “rock,” yet claims an exclusive economic zone around Okinotorishima.

Why Japan received special treatment

Japan is not a claimant to the Spratly or Paracel Islands. That makes it useful for Beijing to portray Tokyo as an outsider importing bloc politics into a regional dispute. Yet Japan is an UNCLOS party, a major trading nation whose ships use the sea, a treaty ally of the United States and an increasingly close security partner of the Philippines. The dispute therefore affects Japanese interests even though Japan claims no feature there.

China’s answer combined four lines of attack. First was jurisdiction: Beijing says the case’s real subject was territorial sovereignty and maritime delimitation, issues the tribunal could not or should not decide. Second was consistency: Okinotorishima tests whether Japan applies Article 121 to itself as it applies it to China. Third was history: Imperial Japan occupied South China Sea features during the Second World War. Fourth was present strategy: Japan supplies maritime-security equipment, conducts exercises and has a Reciprocal Access Agreement with the Philippines.

This explains the intensity. A generic legal disagreement became an argument over Japan’s identity: peaceful defender of rules in Tokyo’s account; historically burdened, strategically interfering power in Beijing’s.

Three questions that must not be confused

A state may own a rock yet receive only a 12-nautical-mile territorial sea around it. Another state may own no land nearby but possess resource rights in an EEZ projected from its mainland coast. “Sovereignty” over land and “sovereign rights” over resources in an EEZ are not synonyms.

A four-part field guide to maritime features

What the award actually found

The five-member tribunal was constituted under Annex VII of UNCLOS; the Permanent Court of Arbitration served as registry. Calling it “the PCA ruling” is convenient shorthand, but the decision came from the UNCLOS arbitral tribunal.

It found no legal basis for Chinese historic rights to resources within the nine-dash line where those rights exceeded UNCLOS maritime zones. It concluded that none of the Spratly high-tide features it examined—including Taiping Island, also called Itu Aba—could generate an EEZ or continental shelf. Mischief Reef and Second Thomas Shoal were low-tide elevations within the Philippines’ EEZ and continental shelf as measured from the Philippine coast.

The tribunal also found that China violated Philippine sovereign rights by interfering with fishing and petroleum activity, constructing installations and failing to prevent Chinese fishermen from operating in relevant Philippine zones. It recognized traditional fishing rights at Scarborough Shoal without deciding sovereignty over the shoal. It further found severe harm from large-scale island building and aggravation of the dispute during proceedings.

How could the case proceed without China?

China declined to participate, but nonappearance is not a veto under Annex VII. Article 9 says a party’s absence does not bar proceedings; the tribunal must independently satisfy itself that it has jurisdiction and that the claim is supported in fact and law. China’s 2014 position paper was treated as evidence of its objections.

Beijing argued that the dispute was truly about sovereignty, that China and ASEAN states had committed to negotiation, and that its 2006 Article 298 declaration excluded maritime delimitation from compulsory settlement. The tribunal answered that the Philippines’ selected submissions could be resolved without deciding land sovereignty or delimiting an overlapping boundary. It also concluded that diplomatic agreements cited by China did not exclude UNCLOS procedures.

Article 296 provides that a decision by a tribunal with jurisdiction is final and must be complied with by the parties. But international adjudication has no global sheriff. Legal obligation and physical enforcement are separate. The award constrains diplomatic legitimacy and shapes other states’ conduct; it did not remove Chinese ships or installations.

Okinotorishima: the pressure point in Japan’s argument

Okinotorishima is a tiny, remote Pacific feature administered by Japan. Tokyo treats it as an island capable of generating an EEZ and continental shelf; China argues that it is a rock under Article 121(3). Beijing’s 2026 statement juxtaposed it with Taiping Island: if the much larger, historically used Taiping cannot generate an EEZ, China asks, how can Okinotorishima?

The 2016 tribunal did not rule on Okinotorishima, and its award is formally binding only on China and the Philippines in that dispute. Japan is therefore not legally estopped by the judgment. Still, the tribunal’s detailed reading of Article 121 is influential. Japan’s support for the award makes its own interpretation vulnerable to charges of selective application. That is a real question of legal consistency even when Beijing’s broader political accusations are rejected.

History is evidence, memory and diplomatic weapon

China’s invocation of Japan’s wartime occupation is historically grounded but does not answer the tribunal’s UNCLOS analysis. Conversely, legal language does not erase history’s political force. In East Asia, states often argue simultaneously in two registers: what treaties permit today and what past conduct says about present trust.

Japan’s stake is practical as well as principled

Sea lanes through Southeast Asia connect Japan with energy suppliers and markets. Tokyo also wants rules that limit attempts to change maritime conditions through superior coast-guard or military force. That interest reaches beyond the South China Sea to Japan’s separate East China Sea dispute with China around the Senkaku Islands, which China calls Diaoyu.

Japan and the Philippines have meanwhile moved from development cooperation toward security partnership. Japan has supplied coastal-surveillance radars and coast-guard assistance; their access agreement makes joint exercises and disaster-response deployments easier. A May 2026 leaders’ statement supported the arbitral award and an effective ASEAN–China code of conduct.

From Tokyo’s perspective, helping Manila improves deterrence and upholds law. From Beijing’s, the same network looks like allied containment extending from the East China Sea through Taiwan to the Philippines. Both perceptions influence operations, even though neither determines the law.

ASEAN’s difficult middle

ASEAN is not one claimant. Brunei, Malaysia, the Philippines and Vietnam have overlapping claims with China; Indonesia is not an island claimant but contests Chinese assertions near the Natuna area; other members have different exposure and relationships with Beijing. Consensus therefore produces cautious language.

The 2002 Declaration on Conduct endorses peaceful resolution, UNCLOS and self-restraint, but it is politically rather than judicially enforceable. Negotiations for a more substantive code of conduct have continued for years. The essential questions are whether a code will be legally binding, cover all disputed waters, regulate coast guards and militias, contain verification, and preserve rights of states not signing it. A vague agreement could lower rhetorical temperature without changing behavior.

What to watch next

The deeper lesson: law can clarify without ending power politics

The 2016 award performed a vital function: it separated land ownership from maritime entitlement and clarified that historical activity does not create unlimited resource rights contrary to UNCLOS. It also documented environmental damage and unsafe interference. But adjudication could not manufacture compliance.

China’s decision to single out Japan shows how legal arguments become embedded in rivalry. Beijing is contesting not only a judgment but who gets to define the regional order. Tokyo is defending not only an abstract treaty but a network of trade routes, partners and precedents that affect its own security.

A durable outcome requires two disciplines at once: states must not treat negotiation as permission for coercion, and supporters of law must apply legal principles consistently—including when those principles create uncomfortable questions for themselves. That is why Okinotorishima belongs in the discussion, even though it was never before the tribunal. The strongest rules-based case is one that survives comparison.