Wong, 30, pleaded guilty in September to a charge of "foreign collusion." Prosecutors accused him of working alongside exiled activist Nathan Law to urge foreign governments to implement sanctions, blockades, and other hostile measures against China.

The sentence marks Wong's second conviction under the national security legislation. He has already been imprisoned since 2020 following previous legal actions, making him the only activist in the city to be prosecuted twice under the sweeping law. Critics and human rights advocates argue that the legislation has been systematically utilized to suppress political opposition and silence dissent in Hong Kong.

Rising to international prominence as a teenager, Wong was a leading face of Hong Kong's 2014 pro-democracy demonstrations and subsequent political movements.