THREAD
The Thai–Cambodian border across two centuries: the Siamese-French treaties of the 1860s to 1907 that drew the line, the Preah Vihear rulings and clashes, the Ta Moan Thom confrontation of February 2025, the July 2025 armed clashes, the ceasefire and the capture of 20 Cambodian soldiers, and the Kuala Lumpur peace process.
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On July 28, 2026, one year after the ceasefire, Cambodia renewed calls for a transparent, independent investigation into the post-ceasefire detention of the 18 soldiers, arguing that accountability is needed to restore trust and ensure future ceasefire commitments are respected under international humanitarian law.
The 18 Cambodian soldiers were released at 10:00 local time via the Prum–Ban Pak Kard checkpoint in Pailin province, under observation of the ASEAN Observer Team and the ICRC. They received a hero's welcome in Cambodia. The ICRC and EU described the release as a significant step toward rebuilding trust.
The 3rd Special Cambodia–Thailand General Border Committee meeting produced a Joint Statement providing for the release of the detained soldiers after full implementation of a 72-hour ceasefire that took effect at noon on December 27, 2025.
Cambodia's Ministry of Foreign Affairs and International Cooperation held a diplomatic briefing on implementation of the 'Kuala Lumpur Joint Declaration on Peace, Cooperation and Prosperity', outlining priority areas and affirming Cambodia's commitment to fulfilling its obligations.
Prime Minister Anutin Charnvirakul of Thailand and Prime Minister Hun Manet of Cambodia signed a Joint Declaration — the 'KL Peace Accord' — on the sidelines of the 47th ASEAN Summit in Kuala Lumpur, witnessed by US President Donald Trump and Malaysian Prime Minister Anwar Ibrahim. It established an ASEAN Observer Team to verify the ceasefire, provided for withdrawal of heavy weapons, humanitarian de-mining, and committed Thailand to promptly release the detained soldiers once the measures were implemented.
The Royal Thai Army issued a statement maintaining that the 18 detained Cambodian soldiers were captured during renewed hostilities initiated by Cambodia, and that they were treated in accordance with international humanitarian law, including the 1949 Geneva Conventions, with ICRC visits permitted.
Thai authorities released two of the captured soldiers on August 1, 2025, citing injury and mental-health concerns. The remaining 18 stayed in Thai custody, described by Thailand as prisoners of war under the Geneva Conventions — a classification Cambodia rejected, arguing they were seized after the ceasefire.
Cambodia says Thai forces captured 20 Cambodian soldiers in their trenches in Preah Vihear province hours after the ceasefire began, after inviting them to shake hands — an episode Cambodia's Information Minister called 'The Most Dangerous Handshake'. Of the 20, 18 were detained, one was killed and one escaped. Thailand says Cambodia breached the ceasefire first with small-arms and grenade attacks in the Phu Makua area (Sisaket) and that the detention occurred during renewed hostilities initiated by Cambodia.
Thailand's Acting Prime Minister and Cambodia's Prime Minister Hun Manet met in Putrajaya, Malaysia, facilitated by Malaysian Prime Minister Anwar Ibrahim, and agreed a ceasefire that took effect at midnight on July 28, 2025. The agreement ended five days of deadly border fighting.
During the 2025 Cambodian–Thai border clashes, Thai media reported that Cambodian BM-21 rockets struck a 7-Eleven PTT gas station in Sisaket province, Thailand, contributing to the escalation of hostilities on 24 July 2025. The Washington Post noted a rocket attack in Sisaket on Dec. 15, but did not identify the target. Other sources confirm rocket fire and civilian casualties but lack specific details about the gas station. The claim remains unverified by independent reporting.
Fighting erupted along sections of the Thai–Cambodian border from July 24, 2025, marking the most serious escalation of the long-running boundary dispute in years. Reported casualty figures differed between the two sides. The clashes continued for five days until a ceasefire was brokered in Putrajaya.
Following a May 28 exchange of fire near Morokot village in which one Cambodian soldier was killed, Prime Minister Hun Manet announced plans to seek an International Court of Justice ruling on several disputed border areas, including the locations of the Ta Moan Thom, Ta Moan Toch and Ta Kro Bei temples. Thailand's foreign minister said its border actions were proportionate and lawful.
Cambodian soldiers and visitors sang the Cambodian national anthem at Ta Moan Thom, an ancient Khmer temple in a border area where delimitation is incomplete (Oddar Meanchey, Cambodia / Surin, Thailand). Thai troops intervened, leading to a verbal confrontation. No casualties were reported. Both militaries later described the situation as normal, with border liaison officers meeting to maintain calm.
On 11 November 2013, the International Court of Justice ruled that the promontory of Preah Vihear is Cambodian territory and ordered Thailand to withdraw its forces from the area. The ruling reaffirmed the court's 1962 decision that awarded the temple to Cambodia. The decision was based on a 1962 map and aimed to resolve the long-standing border dispute between the two countries.
On 18 July 2011, the International Court of Justice (ICJ) ordered Thailand and Cambodia to withdraw their troops from a provisional demilitarised zone around the Preah Vihear temple, following clashes in the disputed border area. The order was issued in the context of the 2008–2011 border crisis. Both countries subsequently agreed to withdraw troops in December 2011, and the ICJ later ruled on the sovereignty of the promontory in 2013.
From late April into early May 2011, Thai and Cambodian forces fought weeks of artillery duels around Preah Vihear and the nearby Ta Moan Thom and Ta Moan Toch temples. More than twenty soldiers and civilians on both sides were killed and tens of thousands of villagers were displaced before a ceasefire held.
On 4 February 2011, Thai and Cambodian forces clashed near the Preah Vihear temple, part of a long-standing border dispute. The fighting continued for several days, resulting in at least ten deaths and displacing thousands of villagers. The clashes were part of the broader 2008–2011 Cambodian–Thai border crisis.
In early April 2009, Thai and Cambodian troops exchanged fire around the Preah Vihear temple in the worst clashes since the October 2008 standoff. Several soldiers on both sides were reported killed, and both governments accused each other of crossing into disputed ground.
The claim of a 15 October 2008 armed clash between Thai and Cambodian troops near Preah Vihear, killing at least three soldiers, is not directly supported by the provided sources. Global Voices (20 October 2008) reports a border clash 'last week' with several soldiers killed, but does not specify the date or casualty count. Other sources cover clashes in 2025 and 2026, not 2008. The exact details of the 2008 incident remain unverified in these candidates.
On 15 July 2008, three Thai citizens were arrested after crossing into the disputed area around the Preah Vihear temple, leading to a military buildup by both Thailand and Cambodia along the border. The standoff escalated over the following days, with both sides sending troops and heavy weapons. The dispute centered on land surrounding the 11th-century temple, which was awarded to Cambodia by the International Court of Justice in 1962.
On 7 July 2008, UNESCO inscribed the 11th-century Preah Vihear temple on its World Heritage List, a decision that heightened longstanding border tensions between Cambodia and Thailand. Within days, both countries deployed troops to the disputed area near the temple, leading to occasional clashes. The temple, a masterpiece of Khmer architecture, has since been a flashpoint in the bilateral dispute, with periodic outbreaks of fighting, including significant clashes in 2011 and 2025.
On 15 June 1962, the International Court of Justice ruled by nine votes to three that the Preah Vihear temple is situated in territory under the sovereignty of Cambodia. The ruling settled a long-standing border dispute between Cambodia and Thailand over the ancient Khmer temple. The ICJ reaffirmed its decision in 2013, and the temple remains a point of contention in bilateral relations.
In 1954, following the French withdrawal from Indochina, Thai forces moved into the Preah Vihear temple area on the Dangrek escarpment. Cambodia protested the occupation, which persisted until the International Court of Justice ruled on the temple in 1962.
On 17 November 1946, Thailand agreed to return to Cambodia the western provinces of Battambang, Siem Reap and Sisophon that it had annexed in 1941 with Japanese mediation. The Washington Accord reversed the last Thai annexation of Cambodian territory and restored the pre-1941 border.
On 9 May 1941, representatives of Thailand and Vichy France signed the Tokyo Convention in Tokyo, Japan, with Japan acting as mediator. The treaty ended the Franco-Thai War and ceded to Thailand the western Cambodian provinces of Battambang, Siem Reap, and Sisophon, as well as parts of Laos. The agreement was a result of Japanese diplomatic intervention following the Battle of Ko Chang in January 1941.
In 1930, Siamese Prince Damrong Rajanubhab visited the Preah Vihear temple as the guest of French colonial officials and was received with Cambodian honours. In its 1962 judgment, the International Court of Justice cited the visit as an occasion on which Siam did not object to the temple's depiction as lying inside French Indochina.
King Chulalongkorn (Rama V) of Siam died on 23 October 1910, ending a 42-year reign. During his rule, Siam ceded its Cambodian provinces to the French colonial empire, a loss that has fueled border disputes between Thailand and Cambodia into the 21st century. The event is widely documented in historical accounts.
On 13 July 1893, French naval vessels, including the aviso Inconstant and gunboat Comète, attempted to sail up the Chao Phraya River to Bangkok, violating Siamese territory. Siamese forts and gunboats fired warning shots, leading to a battle at Paknam. The French emerged victorious, blockaded Bangkok, and the ensuing crisis ended with Siam ceding territory to France, expanding French Indochina.
On 17 October 1887, France formally created the Indochinese Union, consolidating its colonial territories in Southeast Asia, including Cochinchina, Annam, Tonkin, and Cambodia. Laos was incorporated into the union in 1899. The union, also known as French Indochina, lasted until 1954, with its capital initially at Saigon and later at Hanoi.
King Chulalongkorn of Siam, who ascended the throne in 1868 at age 15, held a second coronation on 16 November 1873, shortly after turning 20. This ceremony signified the end of the regency of Somdet Chaophraya Sri Suriwongse and the king's assumption of full ruling powers. The event took place in Bangkok, Siam, and is recorded in historical accounts of his reign.
King Mongkut (Rama IV) of Siam died on 1 October 1868 in Bangkok, after contracting malaria during an expedition to observe a solar eclipse. His 15-year-old son, Chulalongkorn, succeeded him as Rama V, with regent Sri Suriwongse ruling until 1873. Chulalongkorn's reign was marked by modernization and the preservation of Siam's independence.
On 15 August 1867, Siam and France signed a treaty in which Siam recognized the French protectorate over Cambodia, while retaining the western provinces of Battambang, Siem Reap, and Sisophon. The treaty was part of a series of agreements that defined the borders between Siam and French Indochina. The claim's date of 15 July 1867 is incorrect; sources indicate the treaty was signed on 15 August 1867.
On 11 August 1863, King Norodom of Cambodia signed a treaty with France, placing Cambodia under French protection and ending its tributary status to Siam. The treaty gave France control over Cambodia's foreign relations in exchange for personal protection for Norodom. This established the French protectorate, which lasted until Cambodia's independence in 1953.
Mongkut, posthumously honored as King Mongkut the Great, became King of Siam (Rama IV) on 2 April 1851, succeeding his half-brother Nangklao (Rama III). He had spent 27 years as a Buddhist monk before his accession. His reign lasted until his death on 1 October 1868 and was marked by modernization and diplomatic engagement with the West.
