Matthew Kroenig’s recent article in this magazine argued that a military strike against Iran would be “the least bad option” for stopping its nuclear program. But the war Kroenig calls for would be far messier than he predicts, and Washington still has better options available.
COLIN H. KAHL is an Associate Professor in the Security Studies Program at Georgetown University’s Edmund A. Walsh School of Foreign Service and a Senior Fellow at the Center for a New American Security. In 2009-11, he was U.S. Deputy Assistant Secretary of Defense for the Middle East.
Opponents of military action against Iran assume a U.S. strike would be far more dangerous than simply letting Tehran build a bomb. Not so, argues this former Pentagon defense planner. With a carefully designed attack, Washington could mitigate the costs and spare the region and the world from an unacceptable threat.
To suggest a nuclear Iran would result in a cascade of proliferation across the Middle East neglects the United States' power to prevent clients from building their own bombs.
Bombing Iran's nuclear program would only be a temporary fix. Instead, the United States should plan a larger military operation that also aims to destabilize the regime and, in turn, resolves the Iranian nuclear crisis once and for all.

Obama speaks about the U.N. Security Council's sanctions on Iran (Kevin Lamarque / Courtesy Reuters)
In "Time to Attack Iran" (January/February 2012), Matthew Kroenig takes a page out of the decade-old playbook used by advocates of the Iraq war. He portrays the threat of a nuclear-armed Iran as both grave and imminent, arguing that the United States has little choice but to attack Iran now before it is too late. Then, after offering the caveat that "attacking Iran is hardly an attractive prospect," he goes on to portray military action as preferable to other available alternatives and concludes that the United States can manage all the associated risks. Preventive war, according to Kroenig, is "the least bad option."
But the lesson of Iraq, the last preventive war launched by the United States, is that Washington should not choose war when there are still other options, and it should not base its decision to attack on best-case analyses of how it hopes the conflict will turn out. A realistic assessment of Iran's nuclear progress and how a conflict would likely unfold leads one to a conclusion that is the opposite of Kroenig's: now is not the time to attack Iran.
BAD TIMING
Kroenig argues that there is an urgent need to attack Iran's nuclear infrastructure soon, since Tehran could "produce its first nuclear weapon within six months of deciding to do so." Yet that last phrase is crucial. The International Atomic Energy Agency (IAEA) has documented Iranian efforts to achieve the capacity to develop nuclear weapons at some point, but there is no hard evidence that Supreme Leader Ayatollah Ali Khamenei has yet made the final decision to develop them.
In arguing for a six-month horizon, Kroenig also misleadingly conflates hypothetical timelines to produce weapons-grade uranium with the time actually required to construct a bomb. According to 2010 Senate testimony by James Cartwright, then vice chairman of the U.S. Joint Chiefs of Staff, and recent statements by the former heads of Israel's national intelligence and defense intelligence agencies, even if Iran could produce enough weapons-grade uranium for a bomb in six months, it would take it at least a year to produce a testable nuclear device and considerably longer to make a deliverable weapon. And David Albright, president of the Institute for Science and International Security (and the source of Kroenig's six-month estimate), recently told Agence France-Presse that there is a "low probability" that the Iranians would actually develop a bomb over the next year even if they had the capability to do so. Because there is no evidence that Iran has built additional covert enrichment plants since the Natanz and Qom sites were outed in 2002 and 2009, respectively, any near-term move by Tehran to produce weapons-grade uranium would have to rely on its declared facilities. The IAEA would thus detect such activity with sufficient time for the international community to mount a forceful response. As a result, the Iranians are unlikely to commit to building nuclear weapons until they can do so much more quickly or out of sight, which could be years off.
Kroenig is also inconsistent about the timetable for an attack. In some places, he suggests that strikes should begin now, whereas in others, he argues that the United States should attack only if Iran takes certain actions -- such as expelling IAEA inspectors, beginning the enrichment of weapons-grade uranium, or installing large numbers of advanced centrifuges -- any one of which would signal that it had decided to build a bomb. Kroenig is likely right that these developments -- and perhaps others, such as the discovery of new covert enrichment sites -- would create a decision point for the use of force. But the Iranians have not taken these steps yet, and as Kroenig acknowledges, "Washington has a very good chance" of detecting them if they do.
RIDING THE ESCALATOR
Kroenig's discussion of timing is not the only misleading part of his article; so is his contention that the United States could mitigate the "potentially devastating consequences" of a strike on Iran by carefully managing the escalation that would ensue. His picture of a clean, calibrated conflict is a mirage. Any war with Iran would be a messy and extraordinarily violent affair, with significant casualties and consequences.
According to Kroenig, Iran would not respond to a strike with its "worst forms of retaliation, such as closing the Strait of Hormuz or launching missiles at southern Europe" unless its leaders felt that the regime's "very existence was threatened." To mitigate this risk, he claims, the United States could "make clear that it is interested only in destroying Iran's nuclear program, not in overthrowing the government." But Iranian leaders have staked their domestic legitimacy on resisting inter-national pressure to halt the nuclear program, and so they would inevitably view an attack on that program as an attack on the regime itself. Decades of hostility and perceived U.S. efforts to undermine the regime would reinforce this perception. And when combined with the emphasis on anti-Americanism in the ideology of the supreme leader and his hard-line advisers, as well as their general ignorance about what drives U.S. decision-making, this perception means that there is little prospect that Iranian leaders would believe that a U.S. strike had limited aims. Assuming the worst about Washington's intentions, Tehran is likely to overreact to even a surgical strike against its nuclear facilities.
- previous-disabled
- Page 1of 4
- next

Sign-up for free weekly updates from ForeignAffairs.com.