Sweden says it is taken 'strong measures at the highest level' following the incident, as concerns mount for Gui Minhai's health and safety.
Jin Bianling, wife of jailed rights lawyer Jiang Tianyong, says her husband will soon be transferred to an unknown prison in China's Henan province.
Anniversary of 1950 diplomatic relations coincides with 1974 Chinese seizure of islands from Vietnam.
The numbers held in captivity continue to grow despite a year-old government pledge to close the farms.
Nguyen Ngoc Gia, released from prison on December 27, 2017, describes his treatment in jail but vows to keep on writing.
Photos of Wang Fuman's snow-encrusted hair went viral, sparking an outpouring of public generosity, but activists say government backed charities have siphoned off much of the funds.
Even small businesses suffer as customs controls are tightened along the countries' shared border.
Yu Wensheng had already been stripped of his license to practice as a lawyer after he agreed to defend a fellow lawyer detained in the July 2015 crackdown on the legal profession.
President Xi Jinping is also being referred to in state media by the title "leader," harking back to the era of late supreme leader Mao Zedong.
Sources say existing conditions are worsened in the region’s overcrowded facilities.
It urges the European Union's member states to raise the issue of human rights violations in all its talks with China.
Amid arrest campaign, Hanoi releases a white paper touting progress in human rights that is quickly dismissed by a former political prisoner.