As per https://learn.microsoft.com/en-us/azure/china/resources-faq
Can I connect between Azure global regions and Azure in China regions?
Azure global regions and Azure in China regions are physically disconnected. However, you can still connect subscriptions in Azure in China and Azure global regions through composite VPN site-to-site or ExpressRoute. You connect the subscription in the Azure in China region with your on-premises site, and connect your on-premises site to your subscription in the Azure global region.
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hth
Marcin