Mr Sunak has faced pressure from Tory backbenchers to toughen the UK's stance on China since he took over as Tory leader and UK prime minister last month. The speech, to the Lord Mayor's Banquet in London, comes after protests in China over the weekend against the country's strict Covid lockdown laws.
Police have made several arrests, and a BBC journalist was detained while covering a protest in Shanghai on Sunday. He was beaten and kicked by the police during his arrest, and held for several hours before being released.