She had traveled to Bangkok to organize support for party chief Sam Rainsy’s return from exile.
Zhou Yongjun says he has no plans other than to seek medical attention and get some rest.
Two-month journey took them through China, Vietnam on the way to a chance for haven in South Korea.
Himit Kari had openly criticized the policies he enforced at a friend’s gathering early this year.
But conditions must be made safe for their return, and rights as citizens established, Rohingya refugees say.
Dhaka plans to relocate about 3,000 people from Cox’s Bazar camps early next month.
Human Rights Watch says dozens of arrests in recent months indicate repression will continue.
Nguyen Van Duc Do is serving an 11-year prison term for criticizing the government's handling of a 2016 chemical waste spill that devastated Vietnam's central coast.
Sources say the authorities are selling out the country’s mineral wealth for a quick fix to the country’s power shortage problems.
Chen Jianfeng was detained shortly after penning an essay in memory of her mentor Cao Shunli, who died in police custody.