Prominent Chinese human rights advocate Chen Guangcheng, who has lived in the United States since leaving China last year, said he expects China will try to interfere with his planned trip to Japan.

"There is no doubt that an authoritarian regime exerts pressure, but the form it will take is hard to predict," he said in an interview late Monday during a visit to Taiwan.

"The basic principle of a dictator is that he does not have any principle at all, but they must realize that they cannot block the trend of democracy," Chen said.