"What I'm doing today is a result of the Chinese government's absurd act of ordering my arrest, while at the same time refusing to allow me to return," he wrote. He added that he wants to be reunited with his relatives "even if the reunion would have to take place behind a glass wall."
In 2009, he was denied entry to Macau, which, like nearby Hong Kong, is a specially administered Chinese region.
Last year, he tried to turn himself into the Chinese Embassy in Washington. In 2010, he was arrested when he tried to enter the Chinese Embassy in Tokyo.
Wu'er rose to fame as a pajama-clad hunger striker haranguing then-Chinese Premier Li Peng during a televised meeting during the Tiananmen protests in Beijing.
He was named No. 2 on the Chinese government's list of 21 wanted student leaders after the military crushed the protests, killing at least hundreds. He has lived in exile in the United States and the self-ruled island of Taiwan since fleeing China.
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Associated Press writer Peter Enav in Taipei, Taiwan, contributed to this report.