We are excited to announce the availability of Encryption by Default for all new EBS volumes created in an account within a region 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/encryption-new-ebs-volumes-default-account-within-region-aws-china-beijing-ningxia/