But fighting has continued daily since December 7, spreading to seven provinces on each side of the border, and Bangkok denied Trump's claim of an agreed truce. Cambodia, which is outgunned and outspent by Bangkok's military, said Monday that Thai forces had expanded their attack "deep into" Cambodian territory.

Thailand is stepping up efforts to inspect domestic shipping vessels in a bid to prevent fuel and military supplies being diverted to Cambodia as the border tension between the two nations persists.

The Defence Ministry has confirmed reports that Cambodia has hired a US-based lobbying firm to wage what it described as an "information war" aimed at swaying international opinion against Thailand amid the ongoing border dispute.

Thailand said it’s taking steps to restrict exports of fuel and arms through a checkpoint with Laos on fears the goods are being diverted to Cambodia as the border clash between the two countries intensifies.

Once scarred by war and genocide, Cambodia’s progress has been built on peace, the resilience of its people and foreign direct investment that has fueled a growing private sector.

The move came as China’s government urged both nations to exercise “utmost restraint” and de-escalate tensions.