def METHOD_NAME(*, aws_region):
    ec2 = boto3.resource("ec2", region_name=aws_region)
    default_vpc_id = None
    for x in ec2.vpcs.filter(Filters=[{"Name": "is-default", "Values": ["true"]}]):
        return x
    # Create default VPC if not exist
    client = boto3.client("ec2", region_name=aws_region)
    r = client.create_default_vpc()
    default_vpc_id = r["Vpc"]["VpcId"]
    return ec2.Vpc(default_vpc_id)