@reuters.com 5 years ago China tightens Russia border checks, approves coronavirus vaccine trials
@reuters.com 5 years ago China seeks to contain 'silent carriers' of coronavirus
@reuters.com 5 years ago On Russian border, China scrambles to contain coronavirus influx
@reuters.com 5 years ago China seeks to contain 'silent carriers' of new coronavirus
@reuters.com 5 years ago China seeks to contain new coronavirus 'silent carriers'