Background
The Cambodia–Thailand Joint Boundary Commission (JBC) is the bilateral mechanism established to conduct land demarcation and resolve technical boundary questions along the Cambodia–Thailand land border. On 6 June 2026 at 11:50 AM, the Cambodian Liaison Group facilitated an ASEAN Observer Team field mission to observe conditions at the Chey Chomneas Border Checkpoint in Thma Da commune, Veal Veng district, Pursat province.
The Ministry of National Defence reported that the site had been subject to incursions, the installation of barbed wire, and the placement of shipping containers by Thai military personnel, actions that the ministry said have prevented some Cambodian families from returning to their homes. Point 3 of the Joint Statement of the Third Special Meeting of the Cambodia–Thailand General Border Committee (GBC) on 27 December 2025 provides for confidence-building and measures aimed at enabling civilians to return safely and with dignity, and the ministry called for the JBC to commence land demarcation work without delay.
Key Developments
– The Ministry of National Defence issued a press release on 6 June 2026 reporting the CLG-facilitated observation by the ASEAN Observer Team (AOT) led under the Philippine chairmanship.
– The ministry described physical changes at the Chey Chomneas site: reported incursions, installation of barbed wire, and deployment of shipping containers in territory asserted as Cambodian sovereign land.
– The ministry reiterated that Cambodia does not recognize unilateral border modification by force and reaffirmed commitment to implement prior joint agreements, including the 27 December 2025 GBC statement and the 26 October 2025 joint declaration on peace between the two countries.
Institutional Role
The Cambodian Liaison Group (CLG) operates as the local coordinating body for Cambodian government interaction with observers and international monitoring teams at border sites. The ASEAN Observer Team (AOT) role in this context is limited to observation, verification, and reporting on conditions at the specified border location under an agreed ASEAN modality.
Policy Context
The Ministry of National Defence framed the field observation within existing bilateral and ASEAN mechanisms for confidence-building and peaceful resolution of border issues. The press release explicitly references commitments made in the Cambodia–Thailand General Border Committee and related joint statements as the governing framework for restoring civilian access and stability in contested localities.
