Creating multi-Region keys - Amazon Key Management Service
Services or capabilities described in Amazon Web Services documentation might vary by Region. To see the differences applicable to the China Regions, see Getting Started with Amazon Web Services in China (PDF).

Creating multi-Region keys

You can create multi-Region keys in the console or by using the Amazon KMS API.

The multi-Region property that you set in this procedure is immutable. You cannot convert a single-Region key to multi-Region key or a convert a multi-Region key to a single-Region key.