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.

President Donald Trump says Thai and Cambodian leaders have agreed to renew a truce after days of deadly clashes threatened to undo a ceasefire he helped broker earlier this year

President Trump is expected to speak with Thailand’s prime minister on Friday, as he seeks burnish his self-styled image as a peacemaker by intervening in a border conflict between Thailand and Cambodia that entered its fifth day.

Armed clashes between Thailand and Cambodia entered a second day on Tuesday, both sides said, in defiance of calls from the United States to stop fighting and adhere to a months-old Trump-brokered peace deal that now looks on the brink of complete collapse.

Trump announced the agreement to restart the ceasefire in a social media posting following calls with Thai Prime Minister Anutin Charnvirakul and Cambodian Prime Minister Hun Manet.

The Royal Thai Army says there will be no ceasefire “until Cambodia ceases its hostilities and attacks against Thai troops and civilians in the border area”

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.