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As Thailand and Cambodia enter ceasefire, nationalist fervor lingers on both sides

Thai soldiers inspect a border area in Ubon Ratchathani province, where the Royal Thai Army said two antipersonnel landmines were found.

Royal Thai Army/AP

July 28, 2025

Thailand and Cambodia have agreed to an 鈥渦nconditional ceasefire鈥 after a long-simmering border conflict erupted into days of intense fighting, the worst in over a decade. But the five-day clash that forced hundreds of thousands to flee their homes along the border will continue to reverberate across Southeast Asia.

At the United States鈥 urging, Cambodian Prime Minister Hun Manet and acting Thai Prime Minister Phumtham Wechayachai met in Malaysia, which currently holds the Association of Southeast Asian Nations (ASEAN) chair. They agreed to stop fighting at midnight on Monday, local time, and the militaries are set to meet Tuesday.

The news comes as a relief to displaced people huddled in the shadow of a 125-foot Golden Buddha in Thailand鈥檚 Det Udom county, about 40 miles north of the border, where nearly a hundred displaced families gathered Sunday to pray for peace.

Why We Wrote This

The ceasefire reached between Thailand and Cambodia on Monday could help hundreds of thousands of displaced people return home 鈥 but it will not end the countries鈥 long-simmering border dispute, or address the troubling precedents set during the latest bout of fighting.

Yet analysts warn that this brief period of fighting has set unsettling precedents for the future of Thai-Cambodian relations and the rules of warfare in the region. Land mines and cluster bomb treaties that affect millions globally have been challenged further, and the front line has expanded since the last bout of conflict in 2011, when fighting was largely limited to Thailand鈥檚 Sisaket province. The conflict has also generated intense nationalist fervor that shows little sign of slowing down.

鈥淭here has been a significant increase in the lethality and type of weaponry used, reflecting military modernization on both sides,鈥 says Greg Raymond of the Strategic and Defence Studies Centre at Australia National University, pointing to the use of drones, land mines, rocket launchers, and cluster munitions. Casualties have been relatively light, he says, but it鈥檚 a 鈥渄isturbing development鈥 nonetheless, especially considering the widespread use of social media today compared with 2011.

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A digital screen displays the colors of the Thai national flag outside a shopping mall on the day the leaders of Cambodia and Thailand agreed to a ceasefire, in Bangkok, July 28, 2025.
Chalinee Thirasupa/Reuters

Online, young Cambodians and Thais are engaging in hostile exchanges that amplify misinformation.

鈥淔or many Thais and Cambodians without a sense of history, this will ... likely have a significant impact鈥 on how the next generation navigates cross-border tensions, says Dr. Raymond. 鈥淎SEAN鈥檚 norms of resolving disputes peacefully have been trampled on, and reinstating them should be a priority for both governments.鈥

Two warfare conventions under threat

The recent Thailand-Cambodia clash marks a rare moment of armed fighting between ASEAN allies, and is part of a century-old conflict over colonial borders. It was sparked, in this instance, by the detonation of a land mine in the Chok Bok border area of Thailand.

Along the border of Cambodia and Thailand, land mines had largely been viewed as a relic of the past. But a probe by Thailand Mine Action Centre confirmed that this area had been thoroughly cleared of old mines, suggesting that Cambodia 鈥 a signatory of the 1997 Ottawa Treaty that bans the use of antipersonnel land mines 鈥 is going back on its commitment. This comes after Ukraine and several other European countries have announced plans to pull out of the treaty.

On Monday, Thailand鈥檚 2nd Army Region added to concerns, stating it detected Cambodia forces planting land mines 鈥 and Chinese-made rockets 鈥 along the front line.

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Cambodia, for its part, has denied using land mines, and criticizes Thailand for its use of cluster munitions 鈥 another kind of weapon that scatters explosive 鈥渂omblets鈥 across an area. Similar to antipersonnel land mines, cluster munitions have been criticized for causing indiscriminate damage, and unexploded submunitions can pose a threat decades after fighting ends.

A spokesperson for the Cambodia Mine Action and Victim Assistance Authority (CMAA) reports that Thai forces launched cluster munitions twice July 25 鈥 on the Phnom Khmouch mountain, located along the border of Preah Vihear, and in Techo Thammachart village in Choam Ksant District 鈥 but officials have been unable to determine casualties amid fighting.

鈥淭he use of cluster munitions 鈥 especially in or near civilian-populated border areas 鈥 is an unacceptable escalation,鈥 said Senior Minister Ly Thuch, first vice president of CMAA, in a statement. 鈥淚t shows complete disregard for human life, humanitarian principles, and regional peace.鈥

Former government legal attach茅 and translator Pongsak Seanhor volunteers to teach at his home temple in Det Udom, Thailand, July 27, 2025.
Christopher Cottrell

Bangkok stated over the weekend that it was acceptable to use cluster weapons against military targets, as it is not a signatory of the 2008 Clusters Munitions Convention.

Pongsak Seanhor, a retired legal attach茅 and translator in the province of Ubon Ratchathani bordering Cambodia and Laos, says that Thai people have rallied around the military and its use of cluster munitions.

鈥淏efore, normal Thai people thought land mines were over, but these past few days they support any kind of bombing from us to save the nation from attack,鈥 he says.

Support for the military remains high

It was 8 a.m. last Thursday, in the lush border village of Nam Yuen, when Yan Yen Selatee 鈥渉eard explosions over and over again,鈥 she says, waving her fingers. 鈥淚t was terrifying.鈥

Soon after, community loudspeakers on trucks 鈥 the sort that usually carry messages for mayoral races or Muay Thai kickboxing matches 鈥 called on residents to evacuate.

鈥淥ur family drove here only in our clothes,鈥 says Ms. Selatee, sitting under a mosquito net in Det Udom, where hundreds settled to wait out the fighting.

Thai army cadets organize supplies and lead classes for children in Det Udom, Thailand, July 27, 2025.
Christopher Cottrell

A few blocks away at the community meeting hall, people who have been displaced lie on reed mats, scrolling on their phones, as women sort through fresh donated baby clothes. At the front of the hall, young army cadets, most of them just 17 or 18 years old, are ready to fight, snapping to attention when asked if they fear the guns or rockets blazing.

As the cadets sound off, children and parents perk up, looks of approval beaming from every face. The community here is unsettled, expressing near-unanimous disdain for Cambodia鈥檚 political elite and military聽over what it considers an invasion, says Mr. Seanhor.

As the ceasefire is set to take effect Tuesday, both countries will look to their militaries for guidance. The cadets in Det Udom are willing to do whatever is asked of them 鈥 whether that means heading to the front lines, or staying in Det Udom to raise morale and help bring families home.

鈥淲e鈥檝e been here for three days, and will stay for as long as it takes to help the people,鈥 says army cadet Chaiyaphat Panla, as he hands out coloring books to children.