Thailand launched air strikes against Cambodia on Monday as a new wave of fighting erupted between the southeast Asian neighbors, marking the potential collapse of a peace plan presided over by US President Donald Trump just two months ago.

Thailand's military said it was considering blocking fuel exports to Cambodia, as fighting between the two countries spread to coastal areas of a disputed border region two days after US President Donald Trump said the sides had agreed to a new ceasefire.

The escalation broke the ceasefire brokered in July by Trump who threatened to halt trade talks with the two countries unless they ended the fight.

A resurgence of violence along the Thai-Cambodia border, including Thai airstrikes on targets in Cambodia on Monday, comes less than two months after the signing of a peace agreement between the countries that was championed by President Donald Trump as part of a global effort to secure peace deals and secure his reputation as a peacemaker.