Thailand and Cambodia Head Back to Battle, Presaging Possible War
from Asia Unbound and Asia Program
from Asia Unbound and Asia Program

Thailand and Cambodia Head Back to Battle, Presaging Possible War

Village security volunteers patrol a village amid deadly clashes between Thailand and Cambodia along a disputed border area, in Buriram province, Thailand, on December 9, 2025.
Village security volunteers patrol a village amid deadly clashes between Thailand and Cambodia along a disputed border area, in Buriram province, Thailand, on December 9, 2025. Athit Perawongmetha/Reuters

Weeks after a Trump-negotiated ceasefire fell apart and Thailand hit Cambodia with air strikes, the two countries seem far from finding another pause, and it is unlikely the U.S. president will step back in.

December 9, 2025 2:46 pm (EST)

Village security volunteers patrol a village amid deadly clashes between Thailand and Cambodia along a disputed border area, in Buriram province, Thailand, on December 9, 2025.
Village security volunteers patrol a village amid deadly clashes between Thailand and Cambodia along a disputed border area, in Buriram province, Thailand, on December 9, 2025. Athit Perawongmetha/Reuters
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Cambodia and Thailand are back at battle. After an incident on November 10 in which a landmine killed a Thai soldier, full-fledged fighting resumed. Just weeks earlier, Thailand withdrew from the peace deal the two sides had signed in the presence of U.S. President Donald Trump.

Now, the situation is getting worse along the border, and the possibility for much more intensive fighting remains. After a series of shots exchanged between soldiers, the Thai air force launched air strikes at the border on December 8, killing five civilians. A spokesman for the Royal Thai Air Force justified the use of air power, stating that “Cambodia had mobilized heavy weaponry, repositioned combat units and prepared fire support elements.” Whether air strikes were necessary is hard to tell, given that Thailand is by far the dominant military actor.

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As of Monday night, December 8, Thailand time, nine Cambodians reportedly had been killed in the most recent round of fighting, while twenty had been injured. The Thai armed forces said three soldiers have been killed and sixty-eight injured. Thousands if not tens of thousands of civilians have been displaced on both sides of the border. Cambodian officials say they are open to immediate talks about the conflict, though whether this is true is highly debatable. Thailand’s foreign minister declined third-party mediation (at least for now) and said Thailand would not talk unless Cambodia made a first move to de-escalate.

According to the Washington Post, Thai Prime Minister Anutin Charnvirakul said Thailand was prepared to launch “all necessary military operations” to defend itself against Cambodia. “From now on, there will be no negotiations of any kind,” he added. Cambodia has responded with no-quarter statements of its own.

It is very likely that the conflict will get worse, and that no resolution is in sight. As I noted in a prior piece, “The Thai military has little reason to tone down the conflict, as it empowers the armed forces, in advance of an upcoming March parliamentary election in the kingdom. By continuing to bolster nationalism, the armed forces may hope that their actions boost support for pro-military parties in March, and prevent the progressive People’s Party (PP), from winning an absolute majority.”

Senior Thai army leaders, also, this time around, have made clear they are tiring of land mines being put along the border, and the army stated that they are clearly trying to decapitate parts of the Cambodian armed forces. “The objective is to render Cambodia militarily ineffective for a long time—for the safety of our children and grandchildren,” said General Chaiyapruek Duangprapat, chief of staff of the Royal Thai Army, according to the news publication the Thai Enquirer, which is highly reputable.

Meanwhile, Cambodia has little desire to withdraw either for fear of looking weak, given almost universal anger among the Cambodian population about the ceasefire failure, which most Cambodians blame on Thailand.

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In addition, Anutin himself now needs to look especially strong for two reasons. Firstly, his party, the Bhumjaithai Party, is probably going to be one of the two biggest parties in the next parliament, along with the People’s Party.

Secondly, Anutin himself faces widespread allegations of corruption in his cabinet, including involving a leading global criminal ring based in Cambodia, so he has to look strong so as not to appear to be favoring graft related to Cambodia—and may hope the border conflict distracts from his cabinet woes. As The Irrawaddy, a prominent Southeast Asian news outlet, has noted, “Deputy Finance Minister Vorapak Tanyawong had to resign unceremoniously due to accusations of his link with BIC Bank in Cambodia, founded by controversial Cambodian businessman Yim Leak.” Anutin himself looks awfully close to those involved in Cambodian corruption, having appointed Vorapak, and Anutin’s government seems to be slow-walking any investigation into ministerial misdeeds.

While President Trump played a role in the initial peace deal, he is now grappling with issues ranging from inflation, divisions within his own party, and squabbles with Europe; he is unlikely to turn himself back to Southeast Asia. He also likes to broker deals with a clear win, which is not probable with Cambodia and Thailand now, given that the conflict is not going to end any time soon. (Secretary of State Marco Rubio has called for an immediate end to hostilities.)

Other actors will have little possible effect on Bangkok and Phnom Penh either. The leading regional organization, the Association of Southeast Asian Nations (ASEAN), meanwhile, has historically proven itself incapable of helping resolve any conflict, including the ongoing civil war in Myanmar; it has done nothing about the catastrophe in Myanmar for over four years since the February 2021 coup. And the channel used between Cambodia and Thailand for decades to quietly handle tensions, the relationship between Cambodian President Hun Sen and longtime Thai political kingmaker and former prime minister Thaksin Shinawatra, has completely broken down.

Malaysian Prime Minister Anwar Ibrahim, the senior statesperson in Southeast Asia and a man respected by both Cambodian and Thai leaders, is attempting to cool tensions and calling for calm. “We urge both sides to exercise maximum restraint, maintain open channels of communication, and make full use of the mechanisms in place,” said Anwar on X. “Malaysia stands ready to support steps that can help restore calm and avert further incidents.” Yet with both sides dug into and having little incentive to stop, the fighting probably will get worse.

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