Westminster Magistrates’ Court will later hear custody appearances for all three of them.
The Hong Kong probe, according to the Metropolitan Police, has nothing to do with an other case involving Russia.
Eleven individuals were held under Section 27 of the National Security Act as part of the inquiry.
The three men facing charges are Chung Biu Yuen, 63, of Hackney; Matthew Trickett, 37, of Maidenhead; and Chi Leung (Peter) Wai, 38, of Staines-upon-Thames.
“I want to reassure the public that we do not believe there is any wider threat to them,” stated Commander Dominic Murphy, the head of the Met’s Counter Terrorism Command. This investigation is still ongoing.
