ASEAN's South China Sea Code of Conduct deadline passes without agreement, as China presses on Sandy Cay

Summary

The Philippines entered 2026 as ASEAN Chair with a stated goal of completing South China Sea Code of Conduct negotiations by mid-year, the most ambitious timeline set since ASEAN and China agreed to negotiate a framework in 2023. The July deadline has now passed without an agreed text. Analysts from Singapore's ISEAS, Chatham House, and The Diplomat had forecast this outcome as early as late 2025, citing irreconcilable positions: China wants a geographically narrow, non-binding document that excludes external parties like the US; ASEAN claimants (the Philippines, Vietnam, Malaysia) want broader scope, enforcement, and freedom for bilateral security partnerships. Meanwhile China's physical activity in the sea has continued during talks: it raised its flag on Sandy Cay in the Spratly Islands and installed new barriers near Second Thomas Shoal.

The split

Beijing argues the CoC process is progressing and that external interference, primarily US freedom-of-navigation operations and the US-Philippines-Japan security architecture, is the destabilising factor. Manila's position is structurally contradictory: President Marcos's administration simultaneously deepens economic engagement with China (agriculture, infrastructure) while anchoring the military relationship with the US, Australia, and Japan. Vietnam and Malaysia hold similar dual-track positions and are unwilling to accept a text that limits their options with external partners. ASEAN's consensus requirement means that Laos and Cambodia, both closely aligned with Beijing, can block any strong statement.

By the numbers

• July 2026, deadline that passed without a CoC text
• 2023, when ASEAN and China committed to completing negotiations "by 2026"
• Sandy Cay (Spratly Islands), where China raised its flag in 2026 during talks
• 6, ASEAN member states with direct South China Sea claims or interests in the outcome
• 3, consecutive missed CoC deadlines since formal negotiations began in 2018

Why it matters

The CoC failure matters for shipping, energy, and defence. The South China Sea carries roughly one-third of global maritime trade. Without a binding framework, Chinese coast guard and maritime militia operations will continue to escalate incrementally, each individual incident too small to trigger a formal response but collectively foreclosing claimant access to fishing grounds and hydrocarbon blocks. For ASEAN, the failure signals the limits of the bloc's consensus diplomacy when confronting a member state's strategic interests.

What to watch

• Whether the ASEAN Summit in October 2026 attempts to revive negotiations or quietly drops the target
• China's next physical move in the Spratlys or Scarborough Shoal following the diplomatic pause
• US freedom-of-navigation operations and any change in frequency or route
• Whether the Philippines files new arbitration cases following the deadline's expiry