Cambodia’s powerful Senate President Hun Sen on Tuesday vowed that his country would carry out a fierce fight against Thailand as a second day of widespread renewed combat between the Southeast Asian neighbors drove tens of thousands of people to flee border areas.

Fighting broke out following a skirmish in which one Thai soldier was killed Sunday night, despite a ceasefire that ended five days of fighting in July over competing territorial claims along their border, which resulted in dozens of civilian and military dead on both sides, and the evacuation of over 100,000 civilians.

Both sides vow to keep fighting

In a statement posted to Facebook and Telegram, Hun Sen claimed that his country had refrained from firing back on Monday, but overnight began to shoot back at Thai forces. He wrote that a strategy of concentrating on where Thailand was advancing would allow Cambodia to "to weaken and destroy enemy forces through counterattacks.”

Thailand’s army said Cambodian forces had fired artillery at a village in Sa Kaeo province early Tuesday morning, though the strike caused no casualties. Thailand says that Cambodian forces also fired at its troops Sunday and Monday, as each side blames the other for firing the first shots.

“Cambodia wants peace, but Cambodia is forced to fight back to defend its territory,” Hun Sen said. Hun Sen was Cambodia’s long-serving prime minister until 2023, when he was succeeded by his son Hun Manet, but is still widely seen as the country’s de facto leader.

Cambodia’s military announced Tuesday that the new fighting had killed seven civilians and wounded 20. A spokesperson for the Thai military announced Tuesday that one solder had been killed and 29 wounded in the new fighting.

Speaking at a news conference, Thai Rear Adm. Surasant Kongsiri said the navy was strengthening its position in eastern Thailand near the border with Cambodia.

Thailand on Monday carried out airstrikes along the frontier, which it said were a defensive action targeting military installations. Surasant said such operation would continue “until attacks stop.”

Villagers on both sides flee to safety

A separate statement from Thailand’s 2nd Army Region, situated along the border, said almost 500 temporary shelters have been set up in four border provinces, accommodating 125,838 people. Additional refugees from the fighting are expected to stay with relatives in safe areas.

It said Cambodia attacked Thai positions with rocket and drone attacks.

Cambodia said people fled villages near the border.

Thai Prime Minister Anutin Charnvirakul said Monday in a televised speech that military operations would be carried out as necessary to defend the country and protect public safety.

“Thailand has never wished for violence. I’d like to reiterate that Thailand has never initiated a fight or an invasion, but will never tolerate a violation of its sovereignty,” he said.

The two nations have a history of ill will

Thailand and Cambodia have a history of enmity over centuries and experience periodic tensions along their land border of more than 800 kilometers (500 miles).

The ceasefire that was agreed to end July’s fighting was brokered by Malaysia and pushed through by pressure from U.S. President Donald Trump, who threatened to withhold trade privileges from the two nations unless they agreed to it.

A more detailed agreement signed in October called for removing heavy weapons and equipment from the border; desisting from disseminating false information, accusations, and harmful rhetoric; implementing measures to restore mutual trust and full diplomatic relations; and coordinating operations to remove land mines.

None of these actions appear to have been implemented in full or in good faith by either side. After the ceasefire, both nations continued to fight a bitter propaganda war using disinformation, alongside minor outbreaks of cross-border violence.

Prisoners and land mines have been sticky issues

A major Cambodian complaint has been that Thailand continues to hold 18 prisoners taken prisoner when the ceasefire became active. Thailand accuses Cambodia of laying new land mines in the areas under dispute, in several cases maiming Thai soldiers. Cambodia says the mines are left over from decades of civil war that ended in 1999.

The mines issue caused Thailand to declare earlier this month that it was indefinitely pausing implementation of the details of the ceasefire until Cambodia apologized for the

U.N. Secretary-General Antonio Guterres expressed concern over the new fighting, especially the use of air strikes and heavy weapons, and called on the warring parties to recommit to the ceasefire.

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Sopheng Cheang reported from Phnom Penh, Cambodia.