AWS IoT Device Defender is now available in Asia Pacific (Hong Kong), extending its footprint to 17 AWS regions. AWS IoT Device Defender is a fully-managed AWS IoT service that makes it easy for customers to manage the end-to-end security of their IoT fleet.

from Recent Announcements https://aws.amazon.com/about-aws/whats-new/2019/10/aws-iot-device-defender-expands-globally/