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Thailand’s unilateral termination of the 2001 Memorandum of Understanding (MoU 2001) on the overlapping maritime claims area in the Gulf of Thailand was not a sign of strategic strength. It was a serious diplomatic miscalculation.
By abandoning the only agreed bilateral framework that had managed the maritime issue for more than two decades, Thailand unintentionally created the very conditions that led Cambodia to pursue compulsory conciliation under the UN Convention on the Law of the Sea (UNCLOS).
For 25 years, the 2001 MoU served an important purpose. It did not settle the maritime boundary. It did not predetermine sovereignty. It did not give away national rights. Rather, it provided a mutually accepted framework for dialogue, restraint, and possible joint development in an area of overlapping claims. Even when negotiations moved slowly, the 2001 MoU preserved one essential value: it kept both countries inside a structured process.
Thailand’s decision to terminate that framework changed the equation. Bangkok may have calculated that withdrawing from the MoU would strengthen its negotiating position, satisfy domestic nationalist pressure, or allow Thailand to reset the dispute on its own preferred terms. But the opposite happened. Once Thailand removed the bilateral mechanism, Cambodia was left with a clear and legitimate alternative: to use the peaceful dispute-settlement mechanisms available under international law.
This is why Cambodia’s decision to initiate compulsory conciliation under UNCLOS should not be portrayed as escalation. It is a lawful, peaceful and responsible response to the collapse of the bilateral framework caused by Thailand’s own unilateral action. Cambodia did not walk away from dialogue. Cambodia moved the issue into a recognised legal process after Thailand walked away from the agreed framework for dialogue.
The strategic fault in Thailand’s approach lies in a basic contradiction. On one hand, Thailand terminated the 2001 MoU, arguing that the old framework was no longer suitable. On the other hand, Thailand has continued to call for bilateral discussions. But bilateralism cannot be invoked selectively. If a country dismantles the framework that made bilateral engagement possible, it cannot then blame the other party for seeking an international legal mechanism to restore order, structure, and predictability.
Thailand’s position is therefore difficult to sustain. It cannot terminate the agreed process and then object when Cambodia turns to another peaceful process. It cannot weaken the framework for negotiation and then accuse Cambodia of undermining negotiation. It cannot replace legal continuity with unilateral action and expect Cambodia to remain passive.
Cambodia’s choice of compulsory conciliation is also carefully measured. Conciliation under UNCLOS is not war by legal means. It is not coercion. It is not a hostile act. It is a peaceful mechanism designed to help states manage difficult maritime disputes when direct negotiations are blocked, exhausted or politically constrained. Its purpose is to clarify issues, facilitate dialogue and produce recommendations that can guide both parties toward a fair and practical settlement.
This is precisely what the Gulf of Thailand needs. The overlapping claims area is not merely a line on a map. It is linked to energy security, economic development, investor confidence, regional stability and the welfare of future generations. Continued uncertainty benefits no one. Cambodia and Thailand both stand to gain from a stable maritime arrangement based on international law, mutual respect and good-faith engagement.
The termination of the 2001 MoU also sends a troubling signal to the region. ASEAN’s strength rests on dialogue, restraint, legal commitments and respect for agreed mechanisms.
When one party abandons a long-standing framework for domestic political reasons, it risks turning a manageable dispute into a more complex legal and diplomatic problem. Such unilateralism does not build trust. It erodes it.
Cambodia’s response demonstrates the opposite approach. Instead of retaliating, Cambodia chose law. Instead of escalating tensions, Cambodia chose peaceful settlement. Instead of allowing uncertainty to deepen, Cambodia chose a process recognised by the international community. This is not only a defence of Cambodia’s maritime rights; it is also a defence of rules-based regional order.
Thailand should therefore reconsider its narrative. The issue is not whether Cambodia has internationalised the dispute. The issue is why Cambodia had to seek an international legal avenue in the first place. The answer is clear: Thailand’s unilateral termination of the 2001 MoU removed the agreed bilateral framework and left Cambodia with no responsible option except to proceed under UNCLOS.
If Thailand truly wants dialogue, it should participate constructively in the conciliation process. If it truly respects international law, it should engage in good faith. If it truly seeks stability in the Gulf of Thailand, it should stop treating legal mechanisms as threats and start treating them as opportunities.
The path forward is not confrontation. It is not political rhetoric. It is not unilateral pressure. The path forward is law, dialogue and mutual respect.
Thailand’s strategic mistake was to believe that terminating the 2001 MoU would strengthen its hand. In reality, it exposed the weakness of unilateralism and strengthened Cambodia’s legal and diplomatic position. Cambodia did not create the crisis. Cambodia responded to it responsibly.
By choosing UNCLOS compulsory conciliation, Cambodia has sent a clear message: maritime disputes must be resolved through law, not pressure; through peaceful mechanisms, not political manoeuvres; and through respect for sovereign rights, not unilateral abandonment of agreed commitments.
Roth Santepheap is a geopolitical analyst based in Phnom Penh. The views and opinions expressed are his own.
