FILE PHOTO: A man stands passively to block a column of army tanks on Changan Avenue east of Tiananmen Square in Beijing in this June 5, 1989 file photo.The tanks did not slow down, but they did turn around him before taking up position in another part of the city. Tanks rolled into the square before dawn on June 4, 1989, to crush a pro-democracy movement. The ruling Communist Party has never released a death toll and fears any public marking of the crackdown could undermine its hold on power. REUTERS/Arthur Tsang/Files