Thailand and Cambodia signed a joint declaration in Kuala Lumpur on October 26, 2025, intended to strengthen implementation of the ceasefire that had halted their deadly July border fighting. Thai Prime Minister Anutin Charnvirakul and Cambodian Prime Minister Hun Manet signed the declaration in the presence of U.S. President Donald Trump and Malaysian Prime Minister Anwar Ibrahim during the 47th ASEAN Summit.
The agreement established additional mechanisms for de-escalation, including an ASEAN Observer Team, the planned withdrawal of heavy weapons from border areas, humanitarian demining and confidence-building measures. It built on the ceasefire reached in Malaysia on July 28 after five days of fighting that killed 48 people and displaced roughly 300,000, according to contemporary reporting.
What Thailand and Cambodia Actually Signed
The October document was a joint declaration reinforcing the July ceasefire rather than a final settlement of the countries' long-running territorial dispute. The two governments reaffirmed their commitment to refrain from the threat or use of force, settle disputes peacefully and respect international law and existing agreements.
The declaration also confirmed that the two sides had signed terms of reference for an ASEAN Observer Team composed of personnel from ASEAN member states. Its stated purpose was to help verify full and effective implementation of the ceasefire.
Trump participated as a witness and had played a significant diplomatic role in the earlier ceasefire effort, including direct contacts with the Thai and Cambodian leadership in July. Malaysia, as ASEAN chair, was also central to the mediation process, with Anwar hosting the July talks and witnessing the October declaration.
The July Fighting and the First Ceasefire
The October agreement followed a serious escalation along the roughly 817-kilometer Thailand-Cambodia border. Fighting that began on July 24 involved artillery, rockets and air operations and became the deadliest confrontation between the neighbors in years.
By the time a ceasefire took effect at midnight on July 28, 48 people had been killed and around 300,000 displaced, according to figures reported at the time. Both countries accused the other of initiating or escalating hostilities, making attribution of individual incidents highly contested.
The ceasefire was subsequently reinforced at an extraordinary General Border Committee meeting in August. Among other provisions, the two sides agreed not to increase forces along the border, not to undertake provocative actions and to maintain troop deployments without advancing toward the other side's positions.
Heavy Weapons, Observers and Demining
One of the most important elements of the October declaration was a commitment to military de-escalation under ASEAN observation and verification. Thailand and Cambodia agreed that heavy and destructive weapons and equipment would be removed from the border and returned to their normal military installations.
The governments were to develop a practical, step-by-step withdrawal plan, initially observed by an interim team and subsequently by the ASEAN Observer Team.
The declaration also called for coordinated humanitarian demining in border areas without prejudicing the unresolved survey and demarcation of the international boundary. That distinction was significant: the confidence-building measures were designed to reduce immediate security risks without resolving competing territorial positions through the ceasefire process itself.
The 18 Cambodian Soldiers
The status of 18 Cambodian soldiers held by Thailand became another important issue in the post-conflict negotiations. The October framework linked their eventual return to the broader de-escalation process.
Their detention remained diplomatically sensitive in the months that followed and later became part of renewed ceasefire negotiations after further fighting erupted in December.
Trade and Economic Agreements Accompanied the Summit
The peace declaration was signed during a broader series of U.S. economic agreements in Kuala Lumpur. Washington and Cambodia reached an Agreement on Reciprocal Trade, while the United States and Thailand announced a framework for a reciprocal trade agreement.
Under the Thailand framework announced on October 26, the United States said it would maintain a 19 percent reciprocal tariff on originating Thai goods, subject to specified exceptions, while Thailand committed to eliminate tariff barriers on approximately 99 percent of goods and address a range of non-tariff barriers. At that stage, however, the full U.S.-Thailand agreement still required further negotiation, signature and domestic procedures before entering into force.
The United States and Thailand also signed a critical-minerals memorandum of understanding aimed at encouraging investment and diversifying supply chains. These economic arrangements were announced alongside the diplomatic agreement, but they were separate instruments with their own terms and implementation processes.
Why the Border Dispute Is So Difficult to Resolve
The Thailand-Cambodia dispute has roots stretching back more than a century. Parts of the frontier were mapped while Cambodia was under French colonial rule, and disagreements over demarcation have repeatedly generated diplomatic and military tension.
Several ancient Khmer temple areas have been particularly sensitive. The dispute is therefore broader than any single ceasefire: military de-escalation can reduce the risk of immediate fighting, while permanent resolution of disputed sections of the boundary requires separate diplomatic and technical processes.
That distinction was embedded in the October declaration. The document emphasized peaceful dispute resolution and international law but did not purport to settle all competing territorial claims.
ASEAN's Expanding Role
The signing took place during the 47th ASEAN Summit in Kuala Lumpur, where Timor-Leste's admission as ASEAN's 11th member was another major regional development. The Thailand-Cambodia process also demonstrated ASEAN's role as a venue for regional crisis management.
The observer mechanism was particularly important because it provided a regional structure for monitoring implementation rather than leaving verification entirely to the two militaries. At the same time, the agreement depended on continued cooperation by Bangkok and Phnom Penh and did not eliminate the underlying border dispute.
Later Developments: The October Accord Did Not End the Conflict
Later events showed the limits of the October breakthrough. Large-scale fighting resumed in December 2025, demonstrating that the Kuala Lumpur declaration had not produced a durable settlement. The renewed clashes lasted about 20 days, killed at least 101 people and displaced more than half a million, according to Reuters.
Thailand and Cambodia then signed another ceasefire on December 27, 2025. That agreement again required an immediate halt to fighting, maintenance of existing troop deployments, renewed border-demarcation work and a strengthened role for the ASEAN Observer Team. It also explicitly stated that the arrangements did not prejudice the ultimate international boundary between the countries.
The December agreement reaffirmed the July ceasefire and earlier agreements, including the October Kuala Lumpur declaration, rather than replacing the unresolved territorial process with a permanent peace settlement.
Where the Process Stood in 2026
Through 2026, the December ceasefire remained the principal framework for preventing another major escalation, but relations continued to be strained by competing allegations over troop positions, landmines, border activity and sovereignty.
Thailand's Foreign Ministry said in July 2026 that Bangkok was adhering to the December ceasefire and remained committed to resolving outstanding issues through existing bilateral mechanisms, while rejecting Cambodian allegations about Thai activities along the frontier. Cambodian officials likewise continued to invoke the December agreement while pressing their own claims about implementation and disputed areas.
The later developments put the October 2025 ceremony in clearer perspective. It was an important attempt to consolidate the July ceasefire and created mechanisms—including ASEAN observation, de-escalation measures and humanitarian demining—that remained relevant after fighting resumed. It did not, however, settle the territorial dispute or guarantee lasting peace. The durability of the process continued to depend on ceasefire compliance, border-management mechanisms and negotiations between Thailand and Cambodia.
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