Today the United States killed Major General Qassem Soleimani, the commander of the Iranian Revolutionary Guard Corps’s Quds Force. The United States is now in a hot war with Iran after having waged war via proxies for the past several decades. This doesn’t mean war, it will not lead to war, and it doesn’t risk war. None of that. It is war. I don’t claim to be an expert on Iran—when I served as deputy assistant secretary of defense for Middle East policy, I used to remind my Iran team at the Pentagon that my regional expertise ended at the...