Hong Kong’s government introduces new subsidiary legislation under its domestic national security framework, clarifying how certain “other offences endangering national security” are handled. The proposed rules establish a classification mechanism under which cases can be brought within national security procedures after receiving a certificate from the city’s chief executive. The legislation is designed to define the scope of national security cases and to close gaps in the application of existing rules, according to reporting on the measure. The subsidiary legislation is gazetted and comes into effect on Tuesday, with the government also submitting proposed amendments to the Legislative Council as part of the ongoing refinement of national security-related processes. Coverage indicates the changes include the ability for certain criminal cases to fall under national security procedures even when the alleged offences occurred before Hong Kong’s 2020 national security law was enacted. The mechanism is framed as a way to formalize what qualifies as national security-related offences and to standardize how such cases are certified and processed under the city’s national security laws.