There are two distinct sides to the AWS cloud: Public and Private.
Amazon Simple Storage Service (Amazon S3) is on the Public side and can be reached though AARNet's excellent peering arranges with AWS. If required, a Direct Connect can also be used to reach these Public-side services.
Virtual interfaces may be configured to access AWS services such as Amazon EC2 and Amazon S3 using public IP space, or resources in a VPC using private IP space.