Thailand and Cambodia agreed on 18 December 2025 to a Thailand-Cambodia ceasefire that halted weeks of armed clashes along their shared border, a contested frontier that saw the worst fighting in years. The ceasefire, signed on 27 December 2025 by Thai Defence Minister Natthaphon Narkphanit and Cambodian Defence Minister Tea Seiha, took effect at 12:00 noon local time with commitments to stop hostilities, maintain current troop deployments and allow civilians in affected border areas to return home. The agreement includes provisions on troop movement restrictions and the planned return of Cambodian soldiers held in Thai custody if the ceasefire holds for 72 hours (Anadolu Ajansı).

The latest escalation followed renewed clashes in early December after a previous ceasefire, brokered in July and reaffirmed in October with external diplomatic support, collapsed. The fighting included artillery exchanges, tank movements, drone activity and at least one reported airstrike by Thai military aircraft in Cambodia’s Banteay Meanchey province, according to official Cambodian accounts.

Casualties and Displacement

Authoritative tallies indicate that the recent clashes killed dozens of people and displaced large numbers of civilians, with displacement figures reaching into the hundreds of thousands. Deaths were recorded on both sides of the border, with civilians among the fatalities. The conflict spread across multiple provinces on both sides before the ceasefire took effect (Hürriyet Daily News).

In addition to humanitarian concerns, the clashes aggravated security risks for border communities, where infrastructure damage and sudden population movements complicated access to basic services. Both states acknowledged the need to reduce risks for affected populations, which informed discussions at the ceasefire negotiations.

Terms of the Ceasefire

Under the agreement, both nations agreed to halt all armed hostilities without prejudice to ongoing border demarcation issues that have historically underpinned disputes over sections of the frontier. The statement specifically provides that:

  • Current troop deployments are to be maintained without further movement.
  • No unprovoked fire, movement of troops or advances toward each other’s positions is permitted.
  • Civilians in affected areas are to be allowed to return to their homes once the agreement is operational.
  • A clause sets out the return of 18 Cambodian soldiers held by Thailand if the ceasefire is kept for 72 hours.

The accord also calls for cooperation on demining and transnational crime suppression efforts, as well as a freeze on troop reinforcements.

Role of Regional and International Actors

The ceasefire followed a period of three days of border talks that took place after a crisis meeting of foreign ministers from the Association of Southeast Asian Nations (hereinafter: ASEAN), of which both Thailand and Cambodia are members, to encourage a cessation of fighting and reduce tensions. China, the United States of America and Malaysia also supported diplomatic efforts aimed at securing a halt to hostilities and stabilising the border situation. ASEAN observers previously monitored earlier ceasefire arrangements, and the bloc’s involvement in negotiation frameworks remained central in the lead-up to the latest agreement.

Concluding Forecast

The Thailand-Cambodia ceasefire offers a structured pause in one of the most intense periods of border tensions between the two Southeast Asian neighbours in recent years. However, the agreement’s durability will depend on several measurable factors.

A primary determinant is whether both parties maintain compliance with the ceasefire terms over the stipulated initial period of 72 hours, which would trigger the agreed return of Cambodian soldiers. If direct consultations and demarcation processes resume without renewed clashes, this could strengthen institutional mechanisms for border management and conflict avoidance.

Alternatively, failure to adhere to the current agreement could lead to renewed hostilities. The history of multiple ceasefire breakdowns in 2025 — including previous agreements mediated by external actors — indicates that structural issues linked to territorial claims remain unresolved. Persistent disagreement on contested border zones could challenge the longevity of this truce.

A third scenario involves expanded regional mediation, wherein ASEAN, China or other external partners might establish a more formalised monitoring or verification framework to increase transparency and confidence between the two governments. This could help contain incidents before they escalate and support the longer-term objectives of border demarcation and civil-military de-escalation.

Finally, territorial disputes are among the most difficult conflicts in politics. Their structure is inherently normative and subjective, as conflicting parties have different perceptions as to what constitutes historically and culturally land that belongs to one side or the other. Usually, territorial disputes never end completely but are paused for the duration of dominance of one actor or the adherence of both parties to a mutual agreement.