A deadly border clash has erupted between Thai and Cambodian forces, with at least 14 people reported dead, most of them civilians, amid escalating tensions along a disputed stretch of the border between the two Southeast Asian neighbors.

The fighting, which broke out early Monday morning, involved small arms fire, artillery, and aerial strikes, according to officials on both sides. It marked one of the deadliest incidents in recent years between Thailand and Cambodia, whose historical disputes over border demarcations and control of culturally significant sites have long simmered.

Thai Defense Ministry spokesperson Surasant Kongsiri confirmed that hostilities occurred in at least six separate areas along the contested border. He said the violence was triggered by a land mine explosion on Sunday, which wounded five Thai soldiers. In response, Bangkok withdrew its ambassador from Phnom Penh and expelled Cambodia’s envoy to Thailand a diplomatic move that further inflamed tensions.

“This was an act of aggression that could not be ignored,” Kongsiri said during a press briefing in Bangkok. “We reserve the right to protect our forces and civilians from continued provocation.”

Cambodian officials, however, accused Thailand of disproportionate retaliation, citing aerial bombardments and artillery strikes that reportedly damaged at least two villages in Cambodia’s border provinces.

“Thailand’s actions are unjustified and risk plunging the region into broader conflict,” said Cambodian Foreign Ministry spokesperson Chhan Sopheak. “We are calling on the international community and ASEAN to intervene before the situation deteriorates further.”

Casualties and Humanitarian Concerns

Preliminary reports confirm that 14 people have died, with at least nine of them civilians, and dozens more have been injured. Several villagers have been displaced, and border communities are now under evacuation advisories. Schools and markets near the border have been closed, and emergency shelters are being set up by local authorities on both sides.

Human rights groups are urging restraint, fearing a repeat of previous border conflicts, including the 2011 clashes near the Preah Vihear temple, which drew condemnation from international observers.

Diplomatic Fallout and Regional Implications

The border flare-up comes at a time of rising nationalist rhetoric in both Thailand and Cambodia. Analysts warn that the situation could undermine regional stability, particularly if the Association of Southeast Asian Nations (ASEAN) fails to respond swiftly.

The UN Secretary-General has called for an immediate ceasefire, while ASEAN’s rotating chair currently Indonesia has offered to mediate talks between the two governments. China and the United States, both with significant strategic and economic interests in Southeast Asia, have issued statements urging dialogue and de-escalation.

Thailand and Cambodia have a long-standing disagreement over several areas along their 800-kilometer shared border, much of which remains poorly demarcated, often leading to sporadic confrontations.

What Comes Next

Military officials from both sides have suggested the possibility of back-channel communication or an emergency meeting mediated by ASEAN. However, with national pride and political posturing on the rise, an immediate resolution remains uncertain.

In the meantime, border communities brace for further violence, and regional powers keep a close watch on what could escalate into a wider Southeast Asian crisis.

The move effectively halts cross-border travel for tourists, traders, and non-essential traffic. Only limited humanitarian and diplomatic exemptions are being allowed, Thai officials confirmed on Tuesday.

The deteriorating relationship reached a flashpoint late last month, when brief armed clashes in a disputed border area resulted in the death of a Cambodian soldier. The incident reignited nationalistic sentiment in both countries and prompted tit-for-tat measures by their respective governments.

In response to Thailand’s closure, Cambodia announced the suspension of all Thai fuel and gas imports, a significant economic blow given Cambodia’s reliance on Thai energy supplies.

Security forces have been deployed on both sides of the border as local communities brace for further disruptions. Analysts warn the standoff could escalate unless both governments return to diplomatic talks.

There has been no official comment yet from ASEAN, though regional observers are calling for urgent mediation to prevent a broader conflict.

The recording, which surfaced online late Tuesday and quickly spread across regional media outlets, has stirred controversy in both countries, raising concerns over sovereignty, military cooperation, and national security.

The Leaked Call

In the call, Prime Minister Paetongtarn and Hun Sen who remains a powerful figure in Cambodian politics despite handing over the premiership to his son, Hun Manet reportedly discussed border security, military coordination, and unspecified “sensitive matters” involving internal governance.

While the exact content of the recording has not been independently verified in full, snippets circulating online suggest that the leaders shared frank opinions about regional military maneuvers and political developments in ASEAN.

PM Paetongtarn’s Response

In a nationally televised statement, Paetongtarn said the phone call was made via her personal device, and she had no knowledge that it would be recorded or shared publicly.

“I regret the impact this has had on our relationship with Cambodia and on regional diplomacy,” she said. “This was a private call with a respected leader, and I did not consent to its recording or release.”

She further emphasized that her government remained committed to supporting the Thai military and maintaining open diplomatic channels with Cambodia.

Cambodia’s Reaction

So far, Phnom Penh has not officially commented on the leak. However, several Cambodian lawmakers and senior officials have expressed concern over what they describe as a “violation of diplomatic norms” and called on Bangkok to conduct a full investigation into how the recording was obtained and released.

Hun Sen himself has remained silent, though Cambodian state media suggested the leak was likely orchestrated by foreign intelligence agencies or political opponents seeking to undermine regional unity.

Rising Tensions Amid Military Posturing

The controversy comes at a time of heightened military presence along the Thai-Cambodian border, where both nations have been conducting exercises and troop mobilizations in recent weeks. While both governments insist the movements are routine, analysts warn that political missteps such as this leak could escalate tensions unnecessarily.

Thailand and Cambodia have long maintained a complex and sometimes uneasy relationship, shaped by historical territorial disputes, especially around the Preah Vihear Temple region, and deep political ties between elite families on both sides.

Regional Implications

The leak may also complicate ASEAN unity efforts, as leaders are preparing for a summit next month in Laos focused on regional security and cybersecurity. Diplomats in the region fear the incident could prompt countries to tighten communication protocols or even reduce direct leader-to-leader engagement, citing espionage risks.

Cybersecurity experts in Bangkok have warned that this case could be the result of sophisticated surveillance or digital interception, calling for a full audit of government communications infrastructure.

The Cambodian Ministry of Defence said the incident occurred on May 28 in an undemarcated area along the shared border, prompting an immediate military buildup on both sides. In a statement, Cambodian officials emphasized the commitment by both countries to “ease tensions” and avoid further escalation.

The announcement follows diplomatic talks led by Thai Defence Minister Phumtham Wechayachai, who said both countries had committed to reverting to 2024-agreed positions to prevent future misunderstandings.

“We are in close communication with our Cambodian counterparts and are committed to maintaining stability along the border,” Phumtham told reporters in Bangkok.

In a show of regional concern, Malaysian Prime Minister Anwar Ibrahim urged both nations to exercise restraint and prioritize dialogue. “Peace and stability in Southeast Asia must remain a collective priority,” Anwar said in a statement.

The contested zone remains a sensitive flashpoint, but analysts say the swift diplomatic response may have prevented a broader crisis.