Defence Minister Phumtham Wechayachai has rejected Cambodian Prime Minister Hun Manet's assertion Thailand has sought agreement on reopening the border, saying the border is not sealed.

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.