Hong Kong: What is happening in the Asian economic hub?

China has passed a controversial national security law which makes activities deemed subversive or secessionist punishable by imprisonment. UK Prime minister Boris Johnson has accused China of breaching a key treaty with Britain by imposing a heavily criticised national security law on Hong Kong. But what is the background to the legislation, why is the UK concerned, and how has the world responded? What is Britain’s link to Hong Kong? Hong Kong island was ceded to Britain after Chinaࢀ™s defeat in the First Opium War in the 19th century, with China later leasing the New Territories, which forms Hong Kongࢀ™s…