in the dozens. It became clear just this week that Iran managed to conceal the fact it was building a second underground facility for uranium enrichment near Qom, 100 miles southwest of Tehran, and that was designed to hold 3,000 centrifuges. Iran is developing at least four variants of its centrifuges, and the more recent designs have far more capacity than most of the ones installed at Natanz.

This makes it easier to conceal chains of centrifuges in a number of small, dispersed facilities and move material from one facility to another. Iran’s known centrifuge production facilities are scattered over large areas of Iran, and at least some are in Mashad in the far northeast of the country—f...

in the dozens. It became clear just this week that Iran managed to conceal the fact it was building a second underground facility for uranium enrichment near Qom, 100 miles southwest of Tehran, and that was designed to hold 3,000 centrifuges. Iran is developing at least four variants of its centrifuges, and the more recent designs have far more capacity than most of the ones installed at Natanz.

This makes it easier to conceal chains of centrifuges in a number of small, dispersed facilities and move material from one facility to another. Iran’s known centrifuge production facilities are scattered over large areas of Iran, and at least some are in Mashad in the far northeast of the country—far harder to reach than Arak, Bushehr and Natanz.

Many of Iran’s known facilities present the added problem that they are located among civilian facilities and peaceful nuclear-research activities—although Israel’s precision-strike capabilities may well be good enough to allow it to limit damage to nearby civilian facilities.

Israel also faces limits on its military capabilities. Strong as Israeli forces are, they lack the scale, range and other capabilities to carry out the kind of massive strike the U.S. could launch. Israel does not have the density and quality of intelligence assets necessary to reliably assess the damage done to a wide range of small and disperse targets and to detect new Iranian efforts.

Any Israeli attack on an Iranian nuclear target would be a very complex operation in which a relatively large number of attack aircraft and support aircraft would participate. The conclusion is that Israel could attack only a few Iranian targets—not as part of a sustainable operation over time, but as a one-time surprise operation.

Iranian persistence in developing nuclear weapons could push the U.S. into launching its own strike on Iran—although either an Israeli or U.S. strike might be used by Iran’s hardliners to justify an all-out nuclear arms race. Further, it is far from clear that friendly Arab Gulf states would allow the U.S. to use bases on their soil for the kind of massive strike and follow-on restrikes that the U.S. would need to suppress Iran’s efforts on a lasting basis.

There are reports that Israel is increasing the range-payload of its nuclear-armed missiles and is developing sea-based nuclear-armed cruise missiles for its submarines.

While Iran is larger than Israel, its population centers are so vu...

Iranian persistence in developing nuclear weapons could push the U.S. into launching its own strike on Iran—although either an Israeli or U.S. strike might be used by Iran’s hardliners to justify an all-out nuclear arms race. Further, it is far from clear that friendly Arab Gulf states would allow the U.S. to use bases on their soil for the kind of massive strike and follow-on restrikes that the U.S. would need to suppress Iran’s efforts on a lasting basis.

There are reports that Israel is increasing the range-payload of its nuclear-armed missiles and is developing sea-based nuclear-armed cruise missiles for its submarines.

While Iran is larger than Israel, its population centers are so vulnerable to Israeli thermonuclear weapons that Israel already is a major “existential” threat to Iran. Moreover, provoking its Arab neighbors and Turkey into developing their nuclear capabilities, or the U.S. into offering them a nuclear umbrella targeted on Iran, could create additional threats, as well as make Iran’s neighbors even more dependent on the U.S. for their security. Iran’s search for nuclear-armed missiles may well unite its neighbors against it as well as create a major new nuclear threat to its survival.

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