Foreign Secretary Dominic Raab said China could block Hong Kong citizens from leaving the region to take up Boris Johnson's offer of a new home in the United Kingdom - and the British government would be powerless to stop it.
Addressing his weekly Prime Minister's Questions in the House of Commons, Johnson said China's new National Security Law is a threat to the rights and freedom of the region and in direct conflict with Hong Kong Basic Law.
The 1984 treaty was supposed to guarantee at least 50 years of Western-style rule of law and civil liberties for Hong Kong under a "One Country, Two Systems" principle until 2047.
Taipei: Taiwan on Wednesday opened an office to facilitate migration from Hong Kong following China's passage of a national security law for the former British colony seen as sharply restricting political opposition and freedom of speech.
"If the British side makes unilateral changes to the relevant practice, it will breach its own position and pledges as well as global law and basic norms governing worldwide relations", the statement continued.
The British government says it will extend residency rights for people from Hong Kong and eventually enable them to acquire British citizenship.
Several protesters have been arrested in Hong Kong under the new laws as police face off with demonstrators opposing the legislation to crack down on separatism and subversion.
Britain's last Hong Kong governor called information of the laws unveiled right away "even worse than I anticipated".
Hong Kong citizens with British National Overseas (BNO) status, along with their dependants, will be given access to five-year work or study visas.
It has responded by announcing plans to allow millions of Hong Kongers with British National Overseas status to relocate with their families and eventually apply for citizenship.
The U.K. created the passports before handing Hong Kong back to China in 1997.
Nearly three million Hong Kong residents are eligible for the passport. Separately, Hong Kong lawmakers passed legislation on June 4 that would punish anyone who shows disrespect for China's national anthem - something that is already a crime in the mainland. After 12 months of settled status, they can apply for citizenship. "We have done so with many other like-minded countries about these events", Morrison said.
The Chinese embassy in London issued a statement stressing that "all Chinese compatriots living in Hong Kong are Chinese nationals".
"Eventually, if they observe as a result of on one thing like that there would be little that we could do to coercively power them", Raab told ITV tv late Wednesday.
The Australian government is thinking of offering similar safe haven arrangements as proposed by the UK Prime Minister Boris Johnson on July 1.
The law makes secessionist, subversive or terrorist activities illegal, as well as foreign intervention in Hong Kong's internal affairs.
'This decision was necessary and timely to maintain Hong Kong's stability, ' chief executive Carrie Lam said.
For the first time ever, the Chinese government will establish its own security agency on Hong Kong soil.