The announcement comes as the top decision-making body of China's parliament deliberates a draft national security law for Hong Kong that pro-democracy activists in the city fear will be used to eliminate dissent and tighten Beijing's control.
"The US scheme to obstruct the passage of the Hong Kong national security law will never prevail", Foreign Ministry spokesman Zhao Lijian asserted.
The law drastically changes the complexion of Hong Kong society, which has long enjoyed special freedoms absent from the mainland that for decades have contributed to the city's status as a global financial hub and a cosmopolitan redoubt for expats.
The law will likely take effect on July 1, which is also the anniversary of Hong Kong's 1997 handover from British to Chinese rule.
Authorities in Beijing and Hong Kong have repeatedly said the legislation is aimed at a few "troublemakers" in Hong Kong and will not affect rights and freedoms, nor investor interests.
Police arrested 53 people on Sunday at the scene of a rally against the national security legislation, which will see China's feared state security police stationed in the city to oversee the law's implementation. Hong Kong's mini-constitution, the Basic Law, and its decades of independent judicial rulings protecting civil rights were to take precedence over Beijing's governance until at least 2047.
US Secretary of State Mike Pompeo earlier denounced Beijing for "decreeing an end to freedom in Hong Kong", warning that the United States will treat Hong Kong as "just another piece of mainland China", since the Chinese Communist Party appears to treat the region in the same way.
The new law will mean that the U.S.
Pro-Beijing figures have indicated that extradition to mainland China, a possibility that sparked months of mass public protest and resistance to attempts at policing them a year ago, could be an option in some cases.
Per the terms of its handover to Chinese rule in 1997, Hong Kong was promised 50 years of limited autonomy under a principle called "One Country, Two Systems".
Hong Kong Chief Executive Carrie Lam listens to reporters' questions during a press conference in Hong Kong, Tuesday, June 23, 2020.
Last month, President Donald Trump responded to China's plans for the security law by saying he was initiating a process to eliminate special economic treatment that has allowed Hong Kong to remain a global financial centre since its handover by the United Kingdom in 1997.
Japanese Chief Cabinet Secretary Yoshihide Suga called the reported passage of the security law "regrettable" at a regular news briefing, adding that it would "undermine the trust of the global community in the "one country, two systems" principle", which he said is "extremely important" to Japan. However, 49% of respondents said they very much opposed the national security law while 27% said they very much supported it. The city's July 1 holiday has always been marked by a large protest march by opposition groups, under the umbrella of the Civil Human Rights Front.