Pro-democracy activists hold photos of detained activists and those kept under surveillance including Liu Xia, left, and her husband and Nobel Peace Prize Laureate Liu Xiaobo, center, and Ding Zilin, founder of Tiananmen Mothers, during a protest in Hong Kong, Friday, June 30, 2017. Chinese President Xi Jinping landed in Hong Kong Thursday to mark the 20th anniversary of Beijing taking control of the former British colony, accompanied by a formidable layer of security as authorities showed little patience for pro-democracy protests. (AP Photo/Ng Han Guan)
{}