The officer who led the first foreign team watching the Cambodia and Thailand border said what his people were for, and what they were not. On 20 August 2025, at Phanom Dong Rak in Thailand’s Surin province, the Malaysian defence attache heading the Interim Observer Team said the team was there to inspect. It was not there to say who was right or wrong. A Thai military officer put his words into English, and a Thai-language broadcaster carried them.
That was four months before the guns stopped. The Interim Observer Team was the stopgap. The ASEAN Observer Team that replaced it is the standing group the bloc keeps on both sides of the border. The sentence still describes the job. Observe, verify, report. None of those is decide.
Two texts govern this. The earlier is the Kuala Lumpur Joint Declaration, which the two prime ministers signed on 26 October 2025. The later is the Joint Statement the two defence ministries signed on 27 December 2025, at a special meeting of the General Border Committee, the standing body where the two defence ministers deal with the border. Paragraph 13 of that December text says where an incident goes. It goes to the Border Coordination Units, the liaison offices each army runs for talking to the other side, watched by the ASEAN Observer Team. Neither text, read from start to finish, gives any body the job of settling what happened.
Inspecting and deciding are separate acts. A team can walk to a spot, look at a crater and write down what it saw. Saying whose shell made it is a further step. Both texts stop before it.
On 6 January 2026 the two governments gave different accounts of the same morning. Thailand said mortar fire from across the border wounded a Thai soldier. Cambodia said a burning rubbish pile blew up and hurt two Cambodian soldiers.
Thailand’s foreign ministry said its forces did not fire back and contacted the Cambodian side to check. Cambodia’s defence ministry spokeswoman said the two sides’ border coordination teams had consulted on the incident and addressed the matter. Thailand’s Prime Minister said the military had told him it was an accident, and that he was seeking clarification on how responsibility would be taken. On the accounts both governments gave, nobody allocated the blame, and neither text asked anyone to.
Cambodia’s filing to the United Nations on 3 January 2026 records no shooting casualty since the ceasefire. That is a fact about one paper. It is not a claim that no such incident happened.
The parts that work do work. The Regional Border Committee, the provincial military body where local commanders meet, met twice in January 2026. Thailand says the first of those, on 15 January, was held informally, and that the observers sat in on the second, from 27 to 29 January. Thailand’s Ministry of Foreign Affairs says the observers attended twenty-one meetings between the two sides up to 30 January 2026. That is Thailand’s own count of how often the machinery met. The release does not say when the count starts or out of how many, so the number carries no rate.
In July 2026 a blast in Oddar Meanchey province hurt four Cambodian soldiers on patrol. The record does not fix the day beyond after the 2nd. Cambodia’s Ministry of National Defence said its own command post and expert teams were working out the cause. Thailand’s defence ministry spokesperson said a rapid inquiry with Thai units had confirmed the blast happened on Cambodian soil and that Thai forces did not cause it. Two national inquiries, opposite answers, and neither government named a joint body to run or receive either.
Each side decides where the observers may go on its own soil, and for the first team the two governments wrote that down. They put out a joint press statement at Kuala Lumpur on 7 August 2025, which Thailand’s foreign ministry published. In it they agreed that each country would host its own team and invite the members serving on its side. The team would not cross the border. For the standing team that took over, Thailand says the observers on the Cambodian side stayed on that side, and that entry should be arranged beforehand. That is Thailand’s account of its own conduct, and this desk found no Cambodian account of the same movement.
The mandate is short, and it comes from outside. At a meeting with both prime ministers in the Philippines in May 2026, the ASEAN Chair, which coordinates the team, said the mandate ran a further three months, to July 2026. What happened at the end of that term, this desk did not reach. The December text says the two sides will strengthen the observers’ roles in consultation with the ASEAN Chair and the observers themselves. That leaves the job with the two sides being watched and the chair that arranges the watching.
Then there is the text that defines the whole thing. The Terms of Reference set out what the observers may do, where they may go, what they must report and what it all costs. In September 2025 a Thai specialist on the border dispute said the document had not been made public. The two prime ministers signed it five weeks later. This desk cannot say whether it has been published since. Four attempts to reach the text, in English, Thai and Khmer, returned mentions of it and no document.
Without it nobody outside the two capitals can check the limits. The first team’s no-crossing rule sat in a text both governments put out. The matching document for the team on the border now has not.
The claim is already being made. On 10 December 2025 Thailand told the United Nations General Assembly, answering a statement by Cambodia, that an observer inspection had confirmed the mines that disabled seven Thai soldiers were new. That was seventeen days before the ceasefire took effect at noon on 27 December 2025, so it sits outside the arrangement described here. It is one government’s account, on its own army broadcaster, of a report this desk has not seen. On Thailand’s account, observer findings on contested facts do exist.
On the record this desk reached, no body has determined what happened in any incident since the ceasefire. That says what was found here. It does not say what exists.
Both capitals now pay more for the same claim. Cambodia cannot point to observers standing at a site and treat that as backing for its own account. Thailand cannot cite an observer check as proof of who did something. The same disclaimer binds both, and the man who led the first observers said it about his own team, before the shooting stopped.
The people who carry the cost are not in the room. Soldiers patrol those sectors on both sides. Residents and returning displaced families live in the border communes. Paragraph 13 of the December text hands their incidents to the Border Coordination Units, and those units answer to the two armies whose accounts they would be arguing with.