Cambodian observers are calling on the government to file an urgent complaint against Thailand at the International Court of Justice (ICJ) following Bangkok’s decision to withdraw from the recently signed peace agreement between the two neighbors.

Men Nat, head of the Cambodia Watch Council, wrote on Facebook that Cambodia should take immediate diplomatic and legal steps in response to Thailand’s cancellation of the peace accord, which had been signed under the watch of the United States and Malaysia. He urged the government to submit an official complaint to the ICJ using key historical documents, including the Franco–Siam Treaty and the attached French maps that define the border, along with the Kuala Lumpur peace agreement and reports from both the International Observation Team (IOT) and the ASEAN Observation Team (AOT).

Men Nat also called on the Cambodian government to engage the United States and Malaysia, whose prime ministers witnessed the peace deal, and to pressure Thailand through high-level diplomatic channels to return to compliance with the accord.

The move follows a statement by Thai Prime Minister Anutin Charnvirakul, reported by The Nation on November 11, announcing that Thailand had revoked all four key provisions of the Kuala Lumpur joint declaration with Cambodia, saying his government would now “fully support military operations for national security.”

Social development researcher Meas Nee wrote on Facebook that Cambodia must heighten its defenses in response to what he described as Thailand’s “provocative and unpredictable actions.” He warned that the situation now poses greater danger than during the five-day border clash in late July.

Meanwhile, former Khmer Rouge tribunal lawyer Kang Rithkiry said Thailand has used Cambodia’s calls for peace as a political weapon since the signing of the Kuala Lumpur peace deal in late October. He noted that border tensions have escalated sharply after the Thai prime minister’s recent visit to China, suggesting that Beijing’s tacit approval may have emboldened Bangkok’s latest moves.

Observers say the fragile calm along the Cambodia–Thailand frontier has now shifted toward a dangerous new phase, where diplomacy and restraint will determine whether the two countries can avoid renewed confrontation.