It is time to clarify the debate over Iran and its nuclear program. It's easy to criticize the current course adopted by the United States and its allies, to huff and puff about Iranian mendacity, to point out that Russia and China won't agree to tougher measures against Tehran, and to detail the leaks in the sanctions already in place. But what, then, should the United States do? The critics are eager to denounce the administration from the sidelines for being weak but rarely detail what they would do to be "tough." Would they attack Iran today? If not, then what should we do? It is time to put up or shut up on Iran.

There are three basic options that the United States and its allies have regarding Iran's nuclear program. We can bomb Iran, engage it diplomatically, or contain...