Phnom penh: Third-party engagement has emerged as a pivotal factor in the ongoing Cambodia-Thailand border conflict, where political trust remains tenuous and public hostility has intensified since the border clashes in July 2025. Neutral and trusted actors are essential in facilitating dialogue, rebuilding confidence, and reducing tensions to promote reconciliation and lasting peace.
According to Agence Kampuchea Presse, several countries and diplomatic actors have been instrumental in de-escalating tensions and preserving space for dialogue amid persistent mistrust. Through mediation, confidence-building measures, and diplomatic engagement, these actors have helped prevent further deterioration and encouraged both sides to pursue peaceful solutions.
As the ASEAN Chair, Malaysia led the mediation efforts, with Prime Minister Anwar Ibrahim actively working to maintain communication and encourage peaceful engagement between Cambodia and Thailand. The ASEAN platform, with direct involvement from the United States and active participation from China, achieved a first-round ceasefire. These efforts underscored a shared recognition that prolonged instability could undermine regional confidence, economic cooperation, and ASEAN unity.
A significant confidence-building measure was the deployment of the ASEAN Observation Team (AOT), tasked with monitoring developments in sensitive border areas to reduce misunderstandings. However, the lack of public reports since July 2025 has raised questions. Greater transparency could strengthen trust and reduce competing narratives. The Philippines, as ASEAN Chair in 2026, has continued to support dialogue and peace efforts between the two neighboring countries.
The United States played a visible role during the crisis, actively supporting the July and October 2025 ceasefire agreements. Washington's involvement helped both sides step back from immediate confrontation and maintain diplomatic communication channels, focusing on de-escalation and conflict management rather than determining sovereignty or taking sides.
China also played a significant diplomatic role, maintaining active communication with both Phnom Penh and Bangkok. A major breakthrough occurred on 28 December 2025, when China hosted a trilateral foreign ministers' meeting in Fuxian, Yunnan Province, resulting in the Fuxian Five-Point Consensus Agreement. This agreement reduced tensions, strengthened dialogue mechanisms, and promoted peaceful dispute management.
France's historical connection to the Cambodia-Thailand boundary issue, as the former colonial power in Indochina, adds another dimension to the diplomatic efforts. French archives related to the dispute could help promote fact-based discussions and peaceful settlement efforts grounded in historical evidence. As a permanent member of the United Nations Security Council, France can support peaceful dialogue, diplomatic engagement, and respect for international law.
Japan is uniquely positioned to play a constructive role in rebuilding trust and advancing reconciliation between Cambodia and Thailand. With decades of close relations and a reputation for avoiding confrontational politics, Japan encourages peaceful dialogue and the normalization of relations, contributing to stability, development, and peaceful coexistence.
Looking forward, Japan could support confidence-building measures, technical dialogue, and humanitarian cooperation in border areas, facilitating exchanges at various levels to restore trust and normal relations. Friendly countries trusted by both Cambodia and Thailand, including the United States, China, ASEAN member states, France, Japan, and others, could issue a joint appeal to resolve disputes peacefully and uphold international law.
The Cambodia-Thailand border conflict highlights the crucial role of trusted third parties in times of low trust between conflicting parties. By encouraging dialogue, reducing tensions, and rebuilding confidence, neutral actors can support reconciliation and peace, keeping the door to diplomacy open. Lasting peace will be achieved through trust, restraint, and dialogue rather than confrontation.