Thailand announced on Monday that it is suspending implementation of its peace agreement with Cambodia after a land-mine explosion injured Thai soldiers near the Sisaket province border.

The accord, signed last month under the mediation of U.S. President Donald Trump and Malaysian officials, was seen as a major step toward stabilising the long-standing dispute between the neighbours.

At least two soldiers were injured when their patrol triggered a mine, and the Thai army indicated one lost his right foot while others sustained serious wounds.

Bangkok alleges the mine was newly planted after barbed-wire defences were removed; Phnom Penh rejects the claim and denies fresh mine-laying.

Prime Minister Anutin Charnvirakul declared that all activities under the bilateral deal must “stop until there is clarity,” noting that the hostilities thought to be ended “had not gone anywhere.” The military chief, General Ukris Boontanondha, announced that the armed forces are halting all agreements until Cambodia demonstrates clear non-hostile intent.

The Malaysia-brokered truce had included the withdrawal of heavy weapons, de-mining operations and the release of 18 Cambodian prisoners of war held in Thailand.

Cambodia’s foreign ministry said it was “gravely concerned” by the suspension and encouraged Thailand to continue implementation while investigations proceed.

Observers warn the breakdown of the deal could reignite one of Southeast Asia’s most serious frontier crises.

Thailand has suspended the prisoner release, paused joint initiatives and indicated that border crossings will remain closed until satisfactory progress is achieved.