AWS Client VPN is now available in the Asia Pacific (Mumbai) and Asia Pacific (Tokyo) AWS Regions. AWS Client VPN is already available in US East (Virginia), US East (Ohio), US West (Oregon), EU (Frankfurt), EU (Ireland), EU (London), Asia Pacific (Singapore), and Asia Pacific (Sydney) AWS Regions. Support for other AWS Regions is coming soon.

from Recent Announcements https://aws.amazon.com/about-aws/whats-new/2019/05/aws-client-vpn-now-available-in-asia-pacific-mumbai-and-asia-pacific-tokyo-aws-regions/