Starting today, Amazon EC2 M5a, M5ad, R5a, R5ad, T3a instances are available in the Asia Pacific (Mumbai) region. Both M5a and R5a instances were first introduced in November of 2018. M5ad and R5ad instances were launched in March of 2019, followed by T3a in April of 2019. All the AMD instances feature 2.5 GHz AMD EPYC 7000 series processors, and are variants of Amazon EC2’s general purpose (M5), memory optimized (R5), and burstable general-purpose (T3) instance families.  

from Recent Announcements https://aws.amazon.com/about-aws/whats-new/2019/11/amazon-ec2-amd-instances-are-now-available-in-asia-pacific-mumbai-aws-region/