Violent clashes between Thailand and Cambodia erupted anew this week along their disputed 817-kilometre border, despite a ceasefire signed in October under U.S. mediation.

The fighting has displaced hundreds of thousands, closed schools, and left dozens dead or wounded — raising fears the conflict could spiral further.

Thailand’s armed forces reported around 400,000 people evacuated from affected provinces, while Cambodian authorities said more than 127,000 villagers were displaced.

Schools in both countries have shut their doors and civilians are sheltering in temporary camps, many under strain from cold weather and uncertainty over when — or whether — they can return home.

Military spokespeople on both sides reported heavy use of weapons: artillery, rockets, drones and even fighter jets, with accusations traded over targeting civilians, hospitals and temples.

On the Thai side, at least five soldiers have died and dozens wounded.

Cambodian officials separately confirmed seven civilians killed and 20 injured, though casualty counts remain fluid as fighting continues.

In a renewed show of international diplomatic engagement, U.S. President Donald Trump announced his intent to intervene by phone to “stop a war between two very powerful countries.” Speaking at a rally in Pennsylvania, he invoked past peacemaking efforts — including earlier British-Asian conflicts — and said he would reach out to both Thai and Cambodian leaders.

“Who else could say, ‘I’m going to make a phone call and stop a war between two very powerful countries, Thailand and Cambodia?’” he asked.

The violence reignited after a ceasefire deal signed in October at the Kuala Lumpur meeting of regional leaders collapsed.

The accord — witnessed by Thailand’s Prime Minister and Cambodia’s Prime Minister, and bearing the name of the Malaysian host — had laid out plans for withdrawing heavy weapons, demobilising forces, clearing mines, and establishing an observer mission.

Those measures had begun in November, but implementation was suspended after a landmine incident reportedly injuring Thai soldiers.

Cambodia denied planting new mines.

With both sides trading blame yet again — Thailand accusing Cambodia of drone and rocket attacks, Cambodia claiming Thai airstrikes and aggression near sacred border temples — the fragile peace has unraveled.

The recent flare-up has now derailed not only diplomacy, but also regional cooperation: Cambodia’s national sporting delegation withdrew from the Southeast Asian Games being held in Thailand this week, citing security concerns for athletes and families.

Despite his critics, President Trump is once more positioning himself as an international mediator capable of leveraging diplomatic pressure.

Whether a single phone call will suffice to halt this new round of hostilities remains uncertain, as border tensions continue to deepen and the human cost mounts.