BEIJING, China (AFP) — The locked-down Chinese city of Xi’an on Monday tightened Covid-19 controls to the “strictest” level, banning residents from driving cars around town in an effort to control the country’s worst outbreak in 21 months. China has stuck to a “zero-Covid” strategy of tight border restrictions, lengthy quarantines and targeted lockdowns as Beijing prepares to welcome thousands of overseas visitors for February’s Winter Olympics. Xi’an — where 13 million residents are facing […]