Prominent social critic and founder of the International Network of Engaged Buddhist (INEB) Sulak Sivaraksa says he has been denied an entry visa to China.
Mr Sulak revealed on Thursday that the Chinese embassy on April 3 rejected his request for a visa to enter the country.
He said he was scheduled to visit his ancestral homeland in China yesterday.
Mr Sulak, who has faced lese majeste lawsuits several times in past decades, said he suspected the rejection of his visa request might be connected to his support of the Dalai Lama, the religious and political leader of Tibet who lives in exile in India.
"They may have let me know that they have felt a bit uncomfortable with my support for the Dalai Lama. But I always insist that I stand by righteousness," Mr Sulak said.
Mr Sulak said he had previously enjoyed good ties with former Chinese leaders in the past.