LONDON - Britain has suspended its extradition treaty with Hong Kong and imposed an arms embargo on the territory over China's national security law.

British Foreign Secretary Dominic Raab said the measures were a "reasonable and proportionate" response to the legislation imposed by Beijing.

He told MPs the extradition treaty was being suspended "immediately and indefinitely" because of concerns new rules could allow cases to be transferred to mainland China.

Earlier, Prime Minister Boris Johnson stressed there was "a balance" to be struck in the UK's relationship with China.