What to do about Iran?

Recently I asked: Whither Iran? (see here)

Now Reaction favourite Fred Kaplan of Slate is asking: How do you solve a problem like Ahmadinejad? (see here)

Not easily, he concludes. So he offers a challenge:

So, here's the big question: If diplomacy is the only rational solution to this problem yet the Iranians just want nukes—in other words, if there is no deal (or at least no deal that the United States would realistically offer) that would compel them to give up their dream—what's the next step?

At this point, I must confess: I don't know. Neither, it seems, does anybody else. So, dear Slate readers, do you have any great ideas? Send them to me. I'll print — and publicly mull over — the best of them.

Needless to say, I don't know either. Diplomacy? Military action? More specifically: What will the European powers do? How will Israel respond? What is there for America to do? Kaplan: "But what if diplomacy fails? What if the Security Council approves some form of sanctions? What if the Europeans and even the Chinese brave the risk that Iran cuts back—or cuts off—their oil supplies? What if, after all this, Iran continues to enrich uranium?"

All good questions. All without good answers. Let Kaplan know what you think -- and, as always, feel free to add your comments here, too.