A person wearing a protective face mask waves a Hong Kong independence flag as protesters take part in a candlelight vigil to mark the 31st anniversary of the crackdown of pro-democracy protests at Beijing's Tiananmen Square in 1989, after police rejects a mass annual vigil on public health grounds, at Victoria Park, in Hong Kong, China June 4, 2020. Several hundreds of protesters gathered in Victoria Park, Hong Kong on Thursday to commemorate the anniversary of the Tiananmen Square massacre. REUTERS/Tyrone Siu

Hong Kong anti-government demonstrators gather at Liberty Square in Taipei to mark the 31st anniversary of the crackdown of pro-democracy protests at Beijing's Tiananmen Square in 1989, Taiwan, June 4, 2020. Towards the end of the vigil, a small group of approximately 50 protesters started marching around the park calling for Hong Kong independence. They protesters waved flags with signs reading "Liberate Hong Kong" and chanted "One Hong Kong, One Nation." REUTERS/Ann Wang

A protester raises his British National Overseas (BNO) passports during a candlelight vigil to mark the 31st anniversary of the crackdown of pro-democracy protests at Beijing's Tiananmen Square in 1989, after police rejects a mass annual vigil on public health grounds, at Victoria Park, in Hong Kong, China June 4, 2020. Towards the end of the vigil, a small group of approximately 50 protesters started marching around the park calling for Hong Kong independence. They protesters waved flags with signs reading "Liberate Hong Kong" and chanted "One Hong Kong, One Nation." REUTERS/Tyrone Siu

Protesters wearing protective face masks and coverings wave Hong Kong independence flags as they take part in a candlelight vigil to mark the 31st anniversary of the crackdown of pro-democracy protests at Beijing's Tiananmen Square in 1989, after police rejects a mass annual vigil on public health grounds, at Victoria Park, in Hong Kong, China June 4, 2020. REUTERS/Tyrone Siu

Hong Kong anti-government demonstrators gather at Liberty Square in Taipei to mark the 31st anniversary of the crackdown of pro-democracy protests at Beijing's Tiananmen Square in 1989, Taiwan, June 4, 2020. Towards the end of the vigil, a small group of approximately 50 protesters started marching around the park calling for Hong Kong independence. They protesters waved flags with signs reading "Liberate Hong Kong" and chanted "One Hong Kong, One Nation." REUTERS/Ann Wang

Protesters wave Hong Kong independence flags as they take part in a candlelight vigil to mark the 31st anniversary of the crackdown of pro-democracy protests at Beijing's Tiananmen Square in 1989, after police rejects a mass annual vigil on public health grounds, at Victoria Park, in Hong Kong, China June 4, 2020. Towards the end of the vigil, a small group of approximately 50 protesters started marching around the park calling for Hong Kong independence. They protesters waved flags with signs reading "Liberate Hong Kong" and chanted "One Hong Kong, One Nation." REUTERS/Tyrone Siu