aws_ip_ranges

data "aws_ip_ranges" "${european_ec2}" {
   regions = [ "eu-west-1", "eu-central-1" ]
   services = [ "ec2" ]
}

resource "aws_security_group" "from_europe" {
   name = "from_europe"

   ingress {
       from_port = "443"
       to_port = "443"
       protocol = "tcp"
       cidr_blocks = [ "\${data.aws_ip_ranges.${european_ec2}.cidr_blocks}" ]
   }

   tags {
       CreateDate = "\${data.aws_ip_ranges.${european_ec2}.create_date}"
       SyncToken = "\${data.aws_ip_ranges.${european_ec2}.sync_token}"
   }

}