Beijing has published a white paper on Hong Kong's role in national security under the 'one country, two systems' principle. The paper says that Hong Kong's efforts to safeguard national security "have never stopped" and will remain an "ongoing process." The State Council released the paper on Tuesday, one day after a Hong Kong court sentenced former media boss Jimmy Lai Chee-ying to 20 years in prison for crimes under the national security law. Authorities said the sentence matched the severity of Lai's offences. The five-chapter white paper states that the central government holds the fundamental responsibility for Hong Kong’s national security. Meanwhile, Hong Kong must fulfill its constitutional duties in guarding security.