Joshua Wong pleaded guilty on Wednesday to conspiring to collude with foreign forces under Hong Kong's 2020 National Security Law.
Prosecutors stated that Wong and co-conspirators lobbied United States politicians, including Marco Rubio and Nancy Pelosi, to impose sanctions on China and Hong Kong.
The 29-year-old activist is already serving a jail term of four years and eight months on a prior subversion conviction scheduled to end in January next year.