Background
The Cambodian Liaison Group (CLG) coordinated an on-site visit by the ASEAN Observer Team in Cambodia (AOT-KH) on 27 August 2026 to inspect reported installations and occupation at the O’ Smach international point of entry in Oddar Meanchey province. The AOT-KH visit included observation, verification, and reporting functions intended to document physical changes on the ground.
The Ministry of National Defence reported that 366 Cambodian civilians—comprising 98 families, including 190 women and 101 children—were prevented from returning to their homes in the O’ Kla Khmom area due to the reported deployment of containers, barbed wire, trenches, embankments, and roadworks. The ministry cited point four of the Joint Statement from the 3rd Special Meeting of the Cambodia-Thailand General Border Committee (GBC) on 27 December 2025 as a basis for requesting immediate joint boundary commission (JBC) demarcation work.
Key Developments
On 27 August 2026 at about 10:00 a.m., Cambodian authorities escorted the ASEAN Observer Team to O’ Smach (O’ Kla Khmom Village, O’ Smach District, Samrong Municipality) to verify reports of physical installations and occupation by Thai military forces. Observers documented the presence of shipping containers, barbed wire fences, dug trenches, embankments, and newly constructed roads on territory identified by Cambodian authorities as within Cambodian administrative boundaries.
The ministry press release characterises the observers’ report as underscoring the urgency of commencing demarcation tasks by the Cambodia–Thailand Joint Boundary Commission (JBC) to allow affected civilians to return to their dwellings safely and with dignity, consistent with existing bilateral agreements.
Institutional Role
The ASEAN Observer Team in Cambodia (AOT-KH) functions as an on-site verification and reporting mechanism when requested by Cambodian authorities and coordinated through the Cambodian Liaison Group. The Joint Boundary Commission (JBC) and the Cambodia-Thailand General Border Committee (GBC) are the institutional mechanisms specified in bilateral agreements for technical delimitation and demarcation work between the two countries.
The ministry invoked historical boundary instruments and memoranda—including Franco‑Siamese conventions, the Commissions of Delimitation records, the 2000 MOU, and the 2003 TOR—to anchor Cambodia’s requests for demarcation and for formal protest of unilateral on‑the‑ground changes.
Policy Context
Cambodia’s public statement asserts a legal-position approach that relies on inherited delimitation outputs and mutually agreed documents to oppose territorial alterations resulting from the use of force or faits accomplis. The ministry stated it will continue formal diplomatic and institutional protest to the Thai side regarding unilateral actions it regards as inconsistent with those agreements.
The press release links the immediate operational issue—blocked civilian movement and physical installations at O’ Smach—to longer‑term border governance processes, emphasising demarcation by the JBC as the prescribed technical remedy under bilateral mechanisms.
Source
Primary source: Ministry of National Defence press release and social media notice dated 27 August 2026 (source URL provided above).
