We are excited to announce the capability to launch Encrypted EBS backed EC2 instances from unencrypted AMIs in AWS China (Beijing) Region operated by Sinnet, and AWS China (Ningxia) Region operated by NWCD. 

from Recent Announcements https://aws.amazon.com/about-aws/whats-new/2019/06/launching-encrypted-ebs-backed-ec2-instances-from-unencrypted-amis-now-available-aws-china-beijing-ningxia/