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 Paetongtarn Shinawatra is facing a major political crisis less than a year into her term, as the Bhumjaithai Party, a key ally, withdrew from the ruling coalition on Wednesday over a leaked phone conversation related to border issues with Cambodia.