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Thailand and Cambodia slide back into border war

Thailand and Cambodia slide back into border war

Force in Play

A fragile new ceasefire holds after three weeks of renewed war killed over 100 and displaced more than half a million.

January 6th, 2026: Mortar incident tests 10-day-old ceasefire

Overview

A new ceasefire signed on December 27 has brought an uneasy pause to three weeks of fighting that killed more than 100 people and sent over half a million fleeing from their homes. Thai airstrikes, Cambodian rocket barrages, and artillery duels scorched the 817‑kilometer frontier after combat reignited on December 8, shattering Trump‑brokered peace deals from July and October.

Trump's December 12 phone calls to both prime ministers produced only confusion—Bangkok denied agreeing to any ceasefire while fighting raged on—before intensive ASEAN and Chinese shuttle diplomacy finally secured the December 27 accord. Now ASEAN observers patrol key sectors, and roughly 200,000 displaced civilians remain in shelters, afraid to return, though a January 6 mortar incident already tested the truce. Whether this fragile ceasefire becomes a foundation for real peace or merely another temporary pause will define 2026 for millions living along the border.

Key Indicators

100+
Deaths in 2025 border conflict
At least 48 killed in July fighting, over 100 total including December's 20-day war.
649,000
Peak displacement from December fighting
Over half a million evacuated at conflict's height; roughly 200,000 remain displaced.
500,000+
Total people displaced across 2025
Combined evacuations from July war and December resurgence.
817 km
Length of contested Thai–Cambodian frontier
December fighting spread across multiple border sectors.
10 days
Age of current ceasefire when tested
January 6 mortar incident violated December 27 truce, described as accidental.

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People Involved

Organizations Involved

Timeline

May 2025 January 2026

18 events Latest: January 6th, 2026 · 5 months ago Showing 8 of 18
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  1. Mortar incident tests 10-day-old ceasefire

    Latest Incident

    Thai forces report Cambodian mortar fire into Ubon Ratchathani province, violating the December 27 truce. Cambodia contacts Thailand claiming the strike was accidental, caused by an operational error.

  2. Thailand and Cambodia sign formal ceasefire, ending 20 days of war

    Diplomacy

    After ASEAN and Chinese mediation, both countries sign a ceasefire agreement calling for immediate halt to military operations, mine clearance and deployment of ASEAN observer teams. The 20-day December conflict killed over 100 and displaced more than half a million.

  3. General Border Committee convenes ceasefire talks

    Diplomacy

    Thai and Cambodian officials hold General Border Committee meeting in Thailand's Chanthaburi province to discuss ceasefire implementation and verification mechanisms.

  4. ASEAN holds emergency foreign ministers meeting

    Diplomacy

    Special ASEAN Foreign Ministers' Meeting convenes in Kuala Lumpur with Thai and Cambodian representatives attending, marking first face-to-face talks since December 8. Malaysia's foreign minister declares ASEAN must take necessary steps to maintain regional peace.

  5. China launches shuttle diplomacy between Bangkok and Phnom Penh

    Diplomacy

    China's Special Envoy for Asian Affairs begins five-day shuttle diplomacy mission, meeting separately with Prime Ministers Anutin and Hun Manet to mediate the border conflict.

  6. Fighting continues despite Trump's ceasefire claim

    Conflict

    Cambodia's defense ministry reports Thai airstrikes and artillery fire ongoing more than 24 hours after Trump announced both countries agreed to cease fire. Bangkok confirms operations continue.

  7. Trump phones both leaders, claims ceasefire agreed—Bangkok disputes

    Diplomacy

    Trump announces separate phone calls with Anutin and Hun Manet, posting on social media that both agreed to cease fire and return to October's Kuala Lumpur Accord. Thailand's foreign ministry and PM immediately dispute this, with Anutin stating no ceasefire was discussed and operations would continue.

  8. Border war enters third day, Trump vows new push

    Conflict

    As shelling and drone strikes continue, with mounting casualties and displacement, Trump says he will call both leaders to revive his earlier ceasefire and "stop" the renewed war.

  9. Cambodia pulls team from Thailand SEA Games

    Consequence

    Phnom Penh withdraws its athletes from the Southeast Asian Games in Thailand, citing security risks and deepening the conflict’s regional fallout.

  10. Artillery war spreads, mass evacuations ordered

    Conflict

    Fighting enters a second day and expands to new fronts along the 817‑kilometer border, with both sides reporting fresh deaths and tens of thousands of civilians sent to shelters.

  11. Cambodia says it is "ready at any time" for talks

    Statement

    Adviser Suos Yara announces Phnom Penh’s willingness to hold immediate bilateral talks, even as Cambodia accuses Thailand of indiscriminate shelling and vows not to beg for negotiations.

  12. Thailand launches new airstrikes, conflict reignites

    Conflict

    Thai jets strike Cambodian military infrastructure near contested passes, answering what Bangkok calls "supporting fire" from Cambodian units and effectively ending the fragile peace.

  13. Trump claims he "stopped a war" with phone calls

    Statement

    Trump tells reporters he preserved the ceasefire after separate calls with both prime ministers, touting tariffs as the key to his influence even as tensions simmer.

  14. Thailand suspends peace deal after landmine blast

    Decision

    Bangkok freezes implementation of the Kuala Lumpur Accord, citing a landmine incident that badly injured a Thai soldier and accusing Cambodia of violating de‑escalation promises.

  15. Kuala Lumpur Peace Accord promises deeper de‑escalation

    Diplomacy

    At an ASEAN summit in Malaysia, Thai and Cambodian leaders sign a U.S.‑backed accord to withdraw heavy weapons, clear mines and deploy regional monitors, with Trump as witness.

  16. Trump‑assisted ceasefire halts first round of fighting

    Diplomacy

    Under Malaysian and ASEAN mediation, and after Trump threatens higher tariffs, Thailand and Cambodia agree to an "immediate and unconditional" ceasefire.

  17. Four‑day border war erupts

    Conflict

    Artillery, rockets and airstrikes pound positions near disputed temples, killing dozens and forcing nearly 300,000 people from their homes on both sides.

  18. Border crisis begins with skirmishes and troop buildups

    Tension

    Localized incidents and military movements along the Thai–Cambodian frontier spark a months‑long border crisis, reviving disputes over maps and temple sites.

Historical Context

3 moments from history that rhyme with this story — and how they unfolded.

2008–2011

2008–2011 Preah Vihear Clashes

Thai and Cambodian forces fought intermittent battles around the Preah Vihear temple after UNESCO listed it as a Cambodian World Heritage site. Artillery duels killed scores, displaced thousands and periodically threatened to widen before ASEAN mediation and an International Court of Justice ruling clarified parts of the frontier.

Then

Fighting eased after ASEAN involvement and provisional troop withdrawals around the temple area.

Now

Legal and diplomatic processes, not battlefield gains, ultimately shaped the border—an outcome now echoed in calls for renewed talks.

Why this matters now

Shows how temple‑centered border clashes between these same countries have de‑escalated through regional diplomacy and courts rather than decisive military victories.

May–July 1999

1999 Kargil Conflict Between India and Pakistan

Pakistani forces and militants infiltrated high‑altitude positions on the Indian side of the Line of Control in Kashmir, sparking weeks of intense mountain warfare and airstrikes. The United States and others leaned hard on Pakistan diplomatically, while India limited operations to contested territory to avoid full‑scale war.

Then

Pakistan withdrew under pressure, and large‑scale fighting stopped without redrawing the international border.

Now

The episode entrenched mutual distrust but also became a textbook case of outside powers helping cap a limited border war.

Why this matters now

Illustrates how external pressure—similar to Trump’s tariff threats—can end a localized but dangerous border conflict without solving the underlying dispute.

1998–2000

Eritrea–Ethiopia Border War

A dispute over the town of Badme escalated into full‑scale war between Eritrea and Ethiopia, killing tens of thousands. After intense fighting and stalemate, the neighbors accepted an internationally brokered ceasefire and boundary commission, yet lived with a tense "no war, no peace" standoff for years.

Then

A ceasefire froze front lines and created a demilitarised security zone, ending open warfare.

Now

The legal border decision remained contested, showing that arbitration without political reconciliation can lock in a brittle, militarised peace.

Why this matters now

Offers a cautionary tale of how today’s Thai–Cambodian accords could halt shooting yet leave a heavily armed, unstable frontier if politics don’t move too.

Sources

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