The leaders of Thailand and Cambodia are visiting different parts of their disputed land border on Thursday as tensions between the two neighbours simmer 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.

On Monday, the Thai army imposed heightened restrictions at border checkpoints with Cambodia following an order from the prime minister to allow only students, medical patients and others with essential needs to enter or leave Thailand.