Tens of millions of residents in China are under stringent COVID-19 restrictions and officials in the city of Shenzhen said it would implement measures on Monday.
China's southern tech hub of Shenzhen said it will adopt tiered antivirus restriction measures starting Monday, while the southwestern metropolis of Chengdu announced an extension of lockdown curbs, as the country grapples with fresh outbreaks. Shenzhen, which went into a weekend lockdown Saturday, announced a new round of COVID-19 testing and vowed to "marshal all…