+--AWS Account A------+ +---AWS Account B----+ | EC2 Instance --+------------+----> S3 Bucket | | (IAM Role) | | (Bucket Policy) | +---------------------+ +-------------------+ { "Version": "2012-10-17", "Statement": [ { "Effect": "Allow", "Principal": { "AWS": "arn:aws:iam::XXXXXXXXXXXX:role/SomeRole" }, "Action": "s3:ListBucket", "Resource": [ "arn:aws:s3:::bucke
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