Lee Ching-yu, wife of NGO worker Lee Ming-cheh who has been held incommunicado in China for more than 170 days, left for Shanghai around noon to connect to a flight to the central province of Hunan where her husband's trial will be held.
"We landed and are on our way to our hotel in Yueyang city," Xiao Yimin, a Taiwanese legal activist accompanying Lee, told AFP in a phone call.
Lee's trial is set to start tomorrow at the intermediate people's court in Hunan's Yueyang city, according to his wife.
The activist's mother also left around noon on a direct flight to Hunan. Both were accompanied by several officials from Taiwan's semi-official Straits Exchange Foundation, which handles relations with the mainland.
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It is unclear if his mother has arrived in Hunan.
Lee went missing during a visit to the mainland in March and Chinese authorities later confirmed he was being investigated for suspected activities "endangering national security".
"I go to (China) not to provoke or argue. I hope to see the arrival of justice and let Lee Ming-cheh return to Taiwan safe and soon," she told reporters before leaving yesterday.
She attempted to fly to Beijing in April to "rescue" her husband but Chinese authorities at that time revoked her travel permit.
Xiao told AFP that Lee was unavailable to speak with media tonight.
Their supporters shared a video on social media today saying it showed workers setting up roadblocks outside the Yueyang courtroom.
Relations between the two sides have worsened since Taiwanese President Tsai Ing-wen took office in May last year. Since then Beijing has cut off all official communications with Taipei.
China sees self-ruled Taiwan as part of its territory waiting to be reunified. It wants Tsai to acknowledge the island is part of "One China", which she has refused to do.
Lee has long supported civil society organisations and activists in China, according to Amnesty International.
He had shared "Taiwan's democratic experiences" with his Chinese friends online for many years and often mailed books to them, said the Taiwan Association for Human Rights.
"Lee hasn't been given any access to his family and a lawyer of his choice since he was detained in March. Such practice does not meet international standards on fair trial," Poon added.