Manzhouli, China's largest land port city in North China's Inner Mongolia Autonomous Region, is in the spotlight as the latest coronavirus flare-up has seen 142 new infections as of Wednesday, which was caused by contaminated imported goods. As a city bordering Mongolia and Russia where many China-Europe freight trains passing through every year, Manzhouli, like some other Chinese port cities, has been standing at the frontline in fighting against imported virus cases. Epidemiologists and insiders warned that loopholes in port management challenge China's dynamic zero-COVID policy.