async def METHOD_NAME(
    ec2_client: EC2Client,
) -> None:
    described_instances = await ec2_client.describe_instances()
    if "Reservations" not in described_instances:
        print("no reservations on AWS. ok.")
        return
    for reservation in described_instances["Reservations"]:
        if "Instances" not in reservation:
            print("no instance in reservation on AWS, weird but ok.")
            continue
        for instance in reservation["Instances"]:
            assert "State" in instance
            assert "Name" in instance["State"]
            assert instance["State"]["Name"] == "terminated"