How can UNCLOS mechanisms be utilised to resolve overlapping maritime claims in the Gulf of Thailand? Compare with the South China Sea Arbitration precedent.

Thailand's cancellation of the 2001 "MoU 44" in May 2026 has left the ~26,000 sq km Overlapping Claims Area (OCA) with Cambodia without any bilateral framework [4]. UNCLOS offers a graduated toolkit — from interim arrangements to compulsory procedures — that can fill this vacuum, though the South China Sea precedent shows its limits.

UNCLOS pathways available in the Gulf of Thailand

• Provisional arrangements: Articles 74(3) and 83(3) oblige states with overlapping EEZ/continental shelf claims to enter practical interim arrangements without prejudice to final delimitation — the legal basis for reviving joint hydrocarbon development.
• Consensual routes: Article 283 requires an exchange of views; Article 284 allows voluntary conciliation.
• Compulsory conciliation (Annex V): available even where a state has excluded delimitation from binding settlement under Article 298 [1]. Cambodia has publicly signalled this route [4]. The Timor-Leste–Australia conciliation (PCA, 2016–18) — the first ever under Annex V — produced a negotiated Maritime Boundaries Treaty, proving non-binding process can yield binding outcomes [2].
• Binding adjudication: Annex VII arbitration or ITLOS under Article 287, if neither party has opted out.

Comparison with the South China Sea Arbitration (2016)

• The Philippines invoked Annex VII against a non-appearing China; the unanimous award addressed historic rights and maritime entitlements, but China's 2006 Article 298 declaration barred the tribunal from delimiting any boundary [3].
• Lesson one: adjudication clarifies law but cannot draw lines where delimitation is excluded — precisely the Thai–Cambodian demand, making conciliation the better fit.
• Lesson two: an award without enforcement invites non-compliance; the Timor model, built on consent, delivered a treaty.
• Unlike the zero-sum South China Sea contest, the OCA has a shared economic incentive — energy security for both — favouring cooperative settlement; ASEAN, lacking a binding dispute mechanism, can only offer good offices.

UNCLOS thus suggests a sequence: resume dialogue, agree interim joint development, and escalate to Annex V conciliation if talks stall. Managing resource disputes through law rather than nationalism strengthens ASEAN centrality and the rules-based Indo-Pacific order that India's Act East Policy supports.