Cambodia’s most influential politician called for a leadership change in Thailand, citing doubts about the prime minister’s ability to manage a border dispute between the two countries.

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.