All coverage
Hong Kong: China threatens retaliation against UK for offer to Hongkongers
By Lily Kuo & Patrick Wintour
Protests break out in Hong Kong as first arrest made under new security law
By Joshua Berlinger & Helen Regan
China's new national security law is already chilling free speech in Hong Kong
By Conor Murray & Jennifer Williams
Why China's national security law could change Hong Kong forever
By James Griffiths
How China's national security law could change Hong Kong forever
By MacKenzie Sigalos
China's National Security Law for Hong Kong, Explained
By Javier C. Hernandez
Hong Kong Security Law Sends a Chill Over the City
By Vivian Wang & Alexandra Stevenson
Hong Kong protests: nearly 400 arrested as security law comes in; UK opens pathway to citizenship - as it happened
By Hannah Ellis-Petersen & Rebecca Ratcliffe