BEIJING (AFP) – The widow of late Chinese Nobel laureate Liu Xiaobo has resurfaced in an online video, weeks after her friends raised concerns about her fate at the hands of the authorities. Liu Xia was last seen in government-released images of her dissident husband’s sea burial on July 15, and China has been under international pressure to free her and let her travel abroad. Liu Xia, 56, has been under de facto house…