In a joint statement, the US, UK, Canada and Australia had expressed their "deep concern" over the move stating that it would undermine the "one country, two systems" framework and "lies in direct conflict with its international obligations under the principles of the legally-binding UN-registered Sino-British Joint Declaration," and it would "undermine the One Country, Two Systems framework."
The legislation has sparked fears that it would eventually leading to erosion of Hong Kong's autonomy as stated under the Sino-British joint declaration of 1997.
The Sino-British joint declaration on the question of Hong Kong was signed in Beijing on December 19, 1984, by the Prime Ministers of China and Britain, Zhao Ziyang and Margaret Thatcher. The two governments agreed that China would reassume control of Hong Kong from July 1, 1997.