A New Strategic Turning Point: Cambodia Initiates Compulsory Conciliation under UNCLOS

A New Strategic Turning Point: Cambodia Initiates Compulsory Conciliation under UNCLOS

A New Strategic Turning Point: Cambodia Initiates Compulsory Conciliation under UNCLO

The decision of the Royal Government of Cambodia to formally notify Thailand and the Secretary-General of the United Nations on 2 June 2026 of its intention to initiate “Compulsory Conciliation” proceedings under the United Nations Convention on the Law of the Sea (UNCLOS) constitutes a significant legal step and a new turning point in the management and resolution of the maritime boundary dispute between Cambodia and Thailand through international legal mechanisms.

This decision does not signify an abandonment of negotiations or an escalation of political tensions. Rather, it reflects Cambodia’s choice to rely on the “rule of law” rather than the “law of power” in safeguarding its sovereignty and lawful maritime rights.

At present, the bilateral framework for addressing maritime boundary issues between Cambodia and Thailand appears to have reached its limits following Thailand’s unilateral termination of the 2001 Memorandum of Understanding (MoU 2001, also known as MoU 44). For more than two decades, the MoU served as the principal bilateral framework for discussions and efforts to resolve overlapping maritime claims between the two countries. It was not merely a political arrangement but also a reflection of the shared commitment of both parties to pursue peaceful solutions in accordance with international law and mutual interests.

However, when Thailand decided to withdraw unilaterally from MoU 2001, the bilateral framework that had long underpinned negotiations effectively ceased to exist. For Cambodia, this withdrawal represents not only the termination of a mechanism but also a clear indication that the prospects for continuing the bilateral negotiating process in its previous form have been substantially diminished.

Under these circumstances, turning to the mechanisms provided under UNCLOS is a lawful and reasonable option, fully consistent with the principles of peaceful dispute settlement enshrined in the Charter of the United Nations.

Compulsory conciliation under UNCLOS means that all parties are required to participate in the conciliation process, but they are not obliged to accept any final recommendation or outcome. The key significance of this mechanism lies in its creation of a neutral forum in which all parties can present their legal, historical, geographical, and technical arguments before an independent conciliation commission composed of five international experts.

Accordingly, this mechanism is not designed to pit the parties against one another. Rather, it establishes an institutional framework for facilitating negotiations based on international legal principles and the objective assessment of independent experts.

The significance of Cambodia’s decision becomes even clearer when compared with the maritime boundary dispute between Timor-Leste and Australia. In 2016, Timor-Leste initiated compulsory conciliation proceedings under UNCLOS to address its maritime boundary dispute with Australia. Despite the complexity of the dispute and the billions of dollars in economic interests involved, the process ultimately enabled both parties to conclude a historic Maritime Boundary Treaty in 2018.

This case demonstrates that compulsory conciliation is not merely a theoretical mechanism on paper. It is a practical and effective process capable of transforming long-standing disputes into durable and mutually acceptable agreements.

Some observers may argue that Cambodia is attempting to “internationalize” its dispute with Thailand. Such an interpretation, however, overlooks a crucial fact: UNCLOS is a legal framework that both Cambodia and Thailand have already accepted as States Parties.

In other words, Cambodia is not bringing the dispute before a forum that Thailand does not recognize. On the contrary, Cambodia is utilizing a mechanism to which both countries have already given their prior consent by becoming parties to UNCLOS. This approach places negotiations within a structured framework governed by clear legal rules, procedures, and independent facilitators, rather than relying solely on negotiations that lack mechanisms to encourage meaningful progress.
 
Maritime disputes are not solely matters of sovereignty. They are also directly linked to security, investment, economic development, and regional political stability.
 
A solution achieved through a peaceful and lawful process would help reduce uncertainty, strengthen confidence between the two countries, and potentially create new opportunities for future economic cooperation, particularly in the development of natural resources in areas with significant potential.
 
The initiation of compulsory conciliation under UNCLOS is therefore not a step toward confrontation between Cambodia and Thailand. Rather, it is a step toward international law. It demonstrates Cambodia’s confidence in the power of law, its commitment to the peaceful settlement of disputes, and its belief that national sovereignty can be protected through internationally recognized legal mechanisms.
 
At a time when many boundary disputes around the world remain deadlocked or risk escalating into the use of force, Cambodia’s decision to pursue a legal pathway reflects diplomatic maturity and a strong commitment to peace. It is not only an effort to safeguard national interests but also a contribution to strengthening a rules-based international order.
 
By: Pin Vichey
Political Science Scholar