The problem is that the Iranians won’t know precisely when that attack will take place. The United States and Israel have long discussed a redline in Iranian nuclear development, which if approached would force an attack on Iran to prevent Tehran from obtaining nuclear weapons. Logically, Iran would seem to have a redline as well, equally poorly designed. At the point when it becomes clear that sanctions are threatening regime survival or that military action is inevitable, Iran must act first, using its military assets before it loses them.

Iran cannot live with either effective sanctions or the type of campaign that the United States would have to launch to take out Iran’s nuclear facilities. The United States can’t live with the consequences of Iranian counteractions to an attack. Even if sanctions were possible, they would leave Iran with the option to do precisely those things Washington cannot tolerate. Therefore, whether the diplomatic or military route is followed, each side has two options. First, the Americans can accept Iran as a nuclear power, or Iran can accept that it must give up its nuclear ambitions. Second, assuming that neither side accepts the first option, each side must take military action before the other side does. The Americans must neutralize counters before the Iranians deploy them. The Iranians must deploy their counters before they are destroyed.

The United States and Iran are both playing for time. Neither side wants to change its position on the nuclear question, although each hopes the other will give in. Moreover, neither side is really confident in its military options. The Americans are not certain that they can both destroy the nuclear facilities and Iranian counters — and if the counters are effective, their consequences could be devastating. The Iranians are not certain that their counters will work effectively, and once failure is established, the Iranians will be wide open for devastating attack. Each side assumes the other understands the risks and will accept the other’s terms for a settlement.

And so each waits, hoping the other side will back down. The events of the past week were designed to show the Americans that Iran is not prepared to back down. More important, they were designed to show that the Iranians also have a redline, that it is as fuzzy as the American redline and that the Americans should be very careful in how far they press, as they might suddenly wake up one morning with their hands full.

The Iranian move is deliberately designed to rattle U.S. President Barack Obama. He has shown a decision-making style that assumes that he is not under time pressure to make decisions. It is not clear to anyone what his decision-making style in a crisis will look like. Though not a prime consideration from the Iranian point of view, putting Obama in a position where he is psychologically unprepared for decisions in the timeframe they need to be made in is certainly an added benefit. Iran, of course, doesn’t know how effectively he might respond, but his approach to Afghanistan gives them another incentive to act sooner than later.

There are some parallels here to the nuclear warfare theory, in which each side faces mutual assured destruction. The problem here is that each side does not face destruction, but pain. And here, pre-emptive strikes are not guaranteed to produce anything. It is the vast unknowns that make this affair so dangerous, and at any moment, one side or the other might decide they can wait no longer."

Meanwhile, in other fascinating news, the death of an outspoken cleric and opponent of the Tehran regime sparks further questions about regime stability.  As always, how these factors interact will determine much about the potential for armed conflict.