The UK has suspended an extradition treaty with Hong Kong following the imposition of controversial new security laws on the territory by China.

Foreign Secretary Dominic Raab announced the "necessary and proportionate" measure in a statement to the House of Commons on Monday, Sky News reports.

China previously vowed to respond firmly with its own measures, though it's as yet uncertain what form this will take.

A day after China's ambassador to the UK Liu Xiaoming warned Britain during a testy BBC interview that it must not "dance to the tune of the Americans," London is said to be ready to move on suspending the UK's own extradition treaty with Hong Kong, following Canada and Australia making the same move.