Thailand's prime minister and Cambodia's influential former premier are visiting different parts of their disputed land border on Thursday as tensions simmer between the two neighbours over a territorial dispute and the Thai government teeters on the brink of collapse.

Thailand is imposing new border restrictions including blocking tourists from entering Cambodia as the two countries engage in retaliation in their border dispute.

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.