Chinese dissident Liu Xiaobo has gone on trial in Beijing on charges of ?inciting subversion of state power?. Liu, a prominent government critic and veteran of the 1989 Tiananmen Square democracy protests, could be jailed for 15 years if convicted. He has been in jail since 2008, after being arrested for writing a document calling for political reform in China. The US, EU, and human rights groups say the trial is politically motivated and have called on Beijing to release Liu. China has dismissed criticism of the trial as an ?unacceptable? attempt to interfere in its internal affairs. Mary Kay Magistad reports.