The squabble has dragged on for decades, flaring into bloody military clashes more than 15 years ago and again in May, when a Cambodian soldier was killed in a firefight.

Thai air strikes rained down on Cambodia as 40,000 Thais fled deadly Cambodian rocket attacks and Bangkok accused Phnom Penh of ‘war crimes’.

Thailand uses ‘air power against military targets as planned’, army says after neighbours accuse each other of opening fire first along border