Amazon DynamoDB Accelerator (DAX) is now available in the EU (London) and EU (Paris) Regions. You can create DAX clusters using Amazon EC2 R4 and T2 instance types in these AWS Regions for applications that require microsecond latency.

from Recent Announcements https://aws.amazon.com/about-aws/whats-new/2019/11/amazon-dynamodb-accelerator-dax-is-now-available-in-the-eu-london-and-eu-paris-regions/