Ai Weiwei 'fights for freedom of expression'

Chinese contemporary artist and activist Ai Weiwei took part in the opening of an exhibition of his work in Stockholm in Sweden via a live video link.

Ai Weiwei's criticism of Beijing has made him a thorn in the side of China's communist authorities and he disappeared into custody for 81 days last year. Upon his release, he was charged with tax evasion.
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