Coronavirus cases on China border with Russia spark lockdowns, tests

China has put one northern city in lockdown and launched citywide coronavirus testing in another, after two local infections involving workers at a port and trade zone respectively, authorities have said.There was one new case each in Dongning and Suifenhe, which both sit on the countryࢀ™s border with Russia.In Dongning, a 40-year-old maintenance worker at a port tested positive on Thursday, triggering the latest measures.