In a roughly one minute-long video posted on YouTube on Friday, Liu Xia speaks directly to the camera while holding a lit cigarette. She was sitting on a white sofa in front of a pot of tea in what appeared to be the living room of a home. "please grant me time to mourn," she says.
Liu's death came as a campaign under President Xi Jinping to quash dissent is gathering strength. Xi has overseen a raft of legislation to bolster national security ahead of a Communist Party congress to be held later this year, where he is expected to further consolidate power.
Liu Xiaoba's incarceration by the Chinese government meant he was unable to collect his Nobel Peace Prize in 2010, and he became the second winner of it to die in state custody, the first being Carl von Ossietzky in Germany in 1938.
The comments are likely to irk China, which has lodged "stern representations" with Western countries that made remarks about Liu Xiaobo, and add fuel to its testy relationship with Australia. Australia depends on China as its largest trading partner, but Beijing is suspicious of Canberra's close military relationship with Washington.
China accused Taiwan President Tsai Ing-wen of aggravating tension across the Taiwan Strait on Friday, citing her comments following the death of Nobel Peace laureate Liu Xiaobo as an example of "repeated arbitrary attacks".
The circumstances recalled the situation in 2010 when Liu was awarded the Nobel Peace Prize while serving an 11-year sentence for "subversion" -- online searches for his name and references to his award, including the empty chair that represented him at the Oslo ceremony, were blocked.
The United States and the European Union urged President Xi Jinping's government to let Liu's widow, the poet Liu Xia, who has been under house arrest since 2010, leave the country. Jared Genser, a US lawyer who represented Liu, said all contact with Liu Xia had been cut off in the past 48 hours.
61-year-old Liu Xiaobo, who was awarded the 2010 Nobel Peace Prize while in jail and was represented by an empty chair at the ceremony in Oslo, died on Thursday due to multiple organ failure following a battle with cancer while still in custody.