Can't select subnet at DocumentDB

When creating a DocumentDB cluster in EU(Ireland), you should be able to see the VPC and subnets in that region in the console. If you do not specify a VPC or subnet group when creating a cluster, the console/API will use the default VPC and subnet group in that region (if it has not been explicitly deleted - this is not normal).

Once the cluster has been created in EU(Ireland), you should be able to connect using VPC peering between EU(Ireland) and EU(France).