Thaksin Shinawatra was set to deliver a lecture in his new role as Cambodia's economic adviser Thursday, amid tensions over Phnom Penh's refusal to extradite the fugitive former Thai premier.

The billionaire, ousted in a 2006 coup and living abroad to avoid jail for graft, planned also to visit the famed Angkor Wat temple and may play golf with Cambodian premier Hun Sen in the afternoon, said cabinet spokesman Phay Siphan.