China's "one country two systems" model of ruling Hong Kong has worked in protecting the city and must continue long term, says Xi Jinping.

The Chinese leader mounted a stern defence of the political system in a speech in Hong Kong, following recent international criticism.

China's "one country two systems" model of ruling Hong Kong has worked in protecting the city and must continue long term, says Xi Jinping.

The Chinese leader mounted a stern defence of the political system in a speech in Hong Kong, following recent international criticism.