Cambodia Initiates UN Mediation in Maritime Dispute with Thailand
On June 2, 2026, Cambodia launched a UN-backed compulsory conciliation process under UNCLOS to resolve a long-running maritime boundary dispute with Thailand in the Gulf of Thailand. The move follows Thailand’s cancellation of a 2001 bilateral agreement on overlapping claims in the 26,000 sq km area, believed to hold $300 billion in energy reserves. Cambodia appointed conciliators, while Thailand initially resisted but later agreed to participate. The dispute has seen deadly border clashes in recent years.
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Thailand Agrees to UN-Backed Conciliation on Maritime Dispute with Cambodia, Freezes Bilateral Talks
Thailand has agreed to participate in a UN-backed compulsory conciliation process under UNCLOS to resolve a long-running maritime boundary dispute with Cambodia in the Gulf of Thailand. Thai Foreign Minister Sihasak Phuangketkeow announced that Bangkok will appoint two conciliators but expressed regret over Cambodia's decision to seek international mediation, stating that bilateral talks should have been attempted first. He confirmed that as long as the UNCLOS process proceeds, Thailand will cease all other bilateral talks, including efforts to manage land border disputes that erupted into armed conflict in 2024-2025, and will keep border gates closed. The dispute centers on the 26,000-square-kilometer Overlapping Claims Area (OCA), believed to hold significant oil and gas reserves. Thailand's decision follows its unilateral withdrawal from a 2001 MoU that had provided a framework for negotiations, a move opposed by its own foreign ministry. The conciliation process will produce non-binding recommendations, and the outcome remains uncertain given differing interpretations of the 1907 Franco-Siamese Treaty.
The DiplomatThailand Agrees to UN-Backed Conciliation with Cambodia on Maritime Dispute
Thailand has agreed to participate in a UN-backed compulsory conciliation process under UNCLOS to resolve a long-running maritime boundary dispute with Cambodia in the Gulf of Thailand. The dispute centers on the 26,000-square-kilometer Overlapping Claims Area (OCA), believed to hold significant oil and gas reserves. Cambodia initiated the conciliation after Thailand unilaterally withdrew from a 2001 bilateral agreement that had provided a framework for negotiations. Thai Foreign Minister Sihasak Phuangketkeow expressed regret over Cambodia's move, stating that bilateral talks should have been attempted first. He also announced that Thailand would cease all other bilateral talks, including those on land border disputes, while the UNCLOS process is ongoing. The conciliation commission will consist of two experts from each country and a fifth chair, and will issue non-binding recommendations. The decision marks a shift for Thailand, which has historically preferred bilateral negotiations and rejected ICJ jurisdiction in the past.
The DiplomatThailand Agrees to UN-Backed Conciliation on Maritime Dispute with Cambodia, Freezes Bilateral Talks
Thailand has agreed to participate in a UN-backed compulsory conciliation process under UNCLOS to resolve a long-running maritime boundary dispute with Cambodia in the Gulf of Thailand. The dispute centers on the 26,000-square-kilometer Overlapping Claims Area (OCA), believed to hold significant oil and gas reserves. Cambodia formally notified Thailand of its decision to seek conciliation after Bangkok unilaterally withdrew from a 2001 bilateral Memorandum of Understanding that had provided a framework for joint exploration and boundary demarcation. Thai Foreign Minister Sihasak Phuangketkeow expressed regret over Cambodia's move, stating that bilateral talks should have been attempted first. He also announced that Thailand would cease all other bilateral talks, including those on land border disputes, and keep border gates closed while the UNCLOS process is ongoing. The article notes that Thailand's participation, despite its historical preference for bilateral negotiations and past rejection of ICJ jurisdiction, reflects concerns about its international reputation. The conciliation commission will issue non-binding recommendations.
The DiplomatThailand to Appoint Conciliators for UN-Backed Mediation with Cambodia Over Maritime Dispute
Thailand will appoint two conciliators to participate in a UN-backed compulsory conciliation process under the United Nations Convention on the Law of the Sea (UNCLOS), initiated by Cambodia on June 2, 2026. The move follows Thailand's unilateral termination of a 2001 bilateral agreement that had provided a framework for talks over a disputed maritime belt in the Gulf of Thailand. The disputed area covers about 26,000 square kilometers and is estimated to hold nearly 12 trillion cubic feet of natural gas and large quantities of oil, valued at around $300 billion. Thai Foreign Minister Sihasak Phuangketkeow expressed dismay at Cambodia's decision to bypass bilateral talks, stating that the conciliation process will not improve overall ties. The mechanism, previously used only by East Timor to resolve a dispute with Australia, delivers non-binding recommendations. The dispute has been ongoing for over 25 years and was exacerbated by intense border clashes in 2025 that killed nearly 150 people and displaced 300,000.
The Hindu: Latest News today from India and the World, Breaking news, Top Headlines and Trending News Videos.Cambodia Initiates Compulsory Conciliation Over Maritime Border Dispute with Thailand
Cambodia has launched a compulsory conciliation process under the United Nations Convention on the Law of the Sea (UNCLOS) to resolve a long-running maritime boundary dispute with Thailand in the Gulf of Thailand. The move follows Thailand's unilateral cancellation of a 2001 memorandum of understanding governing joint offshore energy exploration and maritime demarcation. Prime Minister Hun Manet announced the decision on state television, emphasizing Cambodia's commitment to peaceful resolution under international law. The dispute centers on the 26,000-square-kilometer Overlapping Claims Area (OCA), believed to hold significant oil and gas reserves. Cambodia has appointed Foreign Minister Prak Sokhonn as its agent and selected two conciliators, including the chair of the Australia-Timor-Leste conciliation commission. Thailand has 21 days to appoint its own conciliators, but Bangkok has expressed reluctance, preferring bilateral negotiations. The land border between the two countries also remains tense after armed clashes in 2023. The conciliation process is non-binding and rarely used, with only one prior instance (Timor-Leste vs Australia in 2016).
The DiplomatCambodia Initiates Compulsory Conciliation Over Maritime Border Dispute with Thailand
Cambodia has launched a compulsory conciliation process under the United Nations Convention on the Law of the Sea (UNCLOS) to resolve a long-running maritime boundary dispute with Thailand in the Gulf of Thailand. The move follows Thailand's unilateral cancellation of a 2001 memorandum of understanding governing joint offshore energy exploration and maritime demarcation. Prime Minister Hun Manet announced the decision on state television, emphasizing Cambodia's commitment to peaceful resolution under international law. The dispute centers on the 26,000-square-kilometer Overlapping Claims Area (OCA), believed to hold significant oil and gas reserves. Cambodia has appointed Foreign Minister Prak Sokhonn as its agent and selected two conciliators, including the chair of the Australia-Timor-Leste conciliation commission. Thailand has 21 days to appoint its own conciliators, but Bangkok has expressed reluctance, preferring bilateral negotiations. The land border between the two countries saw violent clashes in 2023, killing nearly 150 people. Analysts suggest Thailand may refuse to participate, potentially generating international sympathy for Cambodia.
The DiplomatCambodia Initiates Compulsory Conciliation Over Maritime Border Dispute with Thailand
Cambodia has launched a compulsory conciliation process under the United Nations Convention on the Law of the Sea (UNCLOS) to resolve a long-running maritime boundary dispute with Thailand in the Gulf of Thailand. The move follows Thailand's unilateral cancellation of a 2001 memorandum of understanding governing joint offshore energy exploration and maritime demarcation. Prime Minister Hun Manet announced the decision on state television, emphasizing Cambodia's commitment to peaceful resolution under international law. The dispute centers on the 26,000-square-kilometer Overlapping Claims Area (OCA), believed to hold significant oil and gas reserves. Cambodia has appointed Foreign Minister Prak Sokhonn as its agent and selected two conciliators, including the chair of the Australia-Timor-Leste conciliation commission. Thailand has 21 days to appoint its own conciliators, but Bangkok has resisted internationalizing the dispute, preferring bilateral negotiations. Thai Foreign Minister Sihasak Phuangketkeow stated the Cambodian move undermines trust. The mechanism is rarely used; the only prior instance was Timor-Leste's 2016 case against Australia, which resulted in a compromise. Tensions remain high along both land and maritime borders after armed clashes in 2024.
The DiplomatCambodia begins UN mediation process to resolve maritime dispute with Thailand
Cambodia initiated a UN-backed dispute resolution process on June 2, 2026, under the United Nations Convention on the Law of the Sea (UNCLOS) to resolve overlapping maritime claims with Thailand in the Gulf of Thailand, where undersea energy reserves are valued at around $300 billion. The move follows Thailand's cancellation last month of a 2001 bilateral agreement (MoU 44) on overlapping claims and energy exploration. Cambodian Prime Minister Hun Manet stated the step was taken to protect Cambodia's sovereignty and maritime rights. The two Southeast Asian nations have disputed maritime territories and their 800-km land border for decades, with fighting erupting in July and December 2025 that killed dozens. Cambodia has demanded withdrawal of Thai forces from areas under Thai control and condemned damage to heritage temples during the clashes.
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