A. Configure AWS CloudTrail in all Regions to record all API activity. Create an Amazon EventBridge (Amazon CloudWatch Events) rule in all unauthorized Regions for ec2:RunInstances events. Use AWS Lambda to terminate the launched EC2 instances.
B. In each AWS account, create a managed IAM policy that uses a Region condition to deny the ec2:RunInstances action in all unauthorized Regions. Attach this policy to all IAM groups in each AWS account.
C. In each AWS account, create an IAM permissions boundary policy that uses a Region condition to deny the ec2:RunInstances action in all unauthorized Regions. Attach the permissions boundary policy to all IAM users in each AWS account.
D. Create a service control policy (SCP) in AWS Organizations to deny the ec2:RunInstances action in all unauthorized Regions. Attach this policy to the root level of the organization.

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