The reescalation of conflict was sparked on May 28, when a Cambodian soldier was killed in an early morning clash between both nations’ troops, in an area called the Emerald Triangle—the shared border between Thailand, Cambodia, and Laos. The area remains disputed as both Thailand and Cambodia lay claims to parts of the region.

Cambodia said on Sunday it had asked the International Court of Justice to resolve its border disputes with Thailand, after a flare-up in their long-running row led the Southeast Asian neighbours to mobilise troops on both sides of the border.