The latest border dispute involved an armed confrontation May 28 in a relatively small contested territory in which one Cambodian soldier was killed.

Thailand's Ministry of Foreign Affairs announced Thursday that it will hand a letter of protest to Cambodia's government after a call between the two countries was allegedly leaked by a high-profile Cambodian official.

Thailand’s prime minister blamed her own military for escalating a border dispute with Cambodia, according to a leaked audio recording, sparking fresh political turmoil in the country as opposition groups called on her to resign.