Starting today, Amazon EC2 I3en instances are available in the AWS GovCloud (US-East), Asia Pacific (Sydney), and Europe (London) AWS Regions. I3en global availability now includes the Asia Pacific (Tokyo, Seoul, Singapore, Sydney), Europe (Frankfurt, Ireland, London), US East (N. Virginia, Ohio, AWS GovCloud), and US West (Oregon, N. California, AWS GovCloud) regions. 

from Recent Announcements https://aws.amazon.com/about-aws/whats-new/2019/09/amazon-ec2-i3en-instances-now-available-aws-govcloud-useast-sydney-and-london/