Why has Cambodia invoked UN arbitration for its maritime dispute with Thailand?

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Cambodia Initiates UN Conciliation for Maritime Dispute with Thailand

Cambodia has initiated a compulsory conciliation process under the United Nations Convention on the Law of the Sea (UNCLOS) following Thailand's unilateral termination of a 2001 bilateral agreement. This agreement had previously served as a framework for negotiations concerning a disputed maritime area in the Gulf of Thailand. The invocation of this UN-backed mechanism aims to address a protracted boundary dispute that encompasses approximately 26,000 square kilometers of sea.
Background of the UN Convention on the Law of the Sea

The United Nations Convention on the Law of the Sea (UNCLOS) is an international treaty that establishes a comprehensive legal framework for all marine and maritime activities. It defines the rights and responsibilities of nations concerning their territorial waters, exclusive economic zones, and continental shelves. UNCLOS also provides for dispute resolution mechanisms, including conciliation, which is a process where a panel of experts offers non-binding recommendations to help parties resolve their differences. This particular mechanism has seen limited use, with East Timor notably employing it to settle a maritime dispute with Australia over a period of less than two years.
The Long-Standing Maritime Boundary Dispute

For over a quarter of a century, both Cambodia and Thailand have asserted claims over a significant swathe of the Gulf of Thailand, measuring roughly 26,000 square kilometers. This extensive area is believed to be rich in natural resources, with estimates suggesting nearly 12 trillion cubic feet of natural gas and substantial quantities of oil, collectively valued at approximately US$300 billion. Previous attempts to demarcate this boundary and manage potential resource extraction have been hampered by the differing claims of the two neighbouring nations.
Thailand's Termination of the Bilateral Agreement

The catalyst for Cambodia's decision to invoke UN conciliation was Thailand's move to unilaterally terminate a bilateral agreement signed in 2001. This agreement had provided a structured platform for discussions and negotiations between the two countries regarding the disputed maritime belt. By ending this framework, Thailand removed a previously established avenue for bilateral talks, prompting Cambodia to seek resolution through the UNCLOS dispute settlement procedures. Thai Foreign Minister Sihasak Phuangketkeow expressed dismay at Cambodia's approach, suggesting that bilateral discussions should have been exhausted before resorting to the UN mechanism.
Implications of the UN Conciliation Process

While Cambodia has opted for the compulsory conciliation process, Thai officials have indicated that this UN-backed procedure is unlikely to improve overall bilateral relations, which have been strained by past border clashes. The Thai Foreign Minister noted that the conciliation panel's recommendations are non-binding, and the duration of this process remains uncertain, contrasting with the potentially shorter timeline of amicable bilateral talks. The invocation of this mechanism signifies Cambodia's pursuit of a formal, internationally recognized process to resolve the significant territorial and resource claims at stake.

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Why has Cambodia invoked UN arbitration for its maritime dispute with Thailand?

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