A military strike would allow Iran to openly pursue nuclear weapons, possibly even increasing their timeline
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Furthermore, Iran could acquire weapon-usable nuclear material (plutonium or HEU) illicitly on the nuclear black-market. Because the amount of fissile material needed for each nuclear weapon is small (the size of an orange, in the case of plutonium) it would not be difficult to smuggle it into Iran. Iran may also be able to acquire weapon-usable fissile material from another country.Therefore, it is possible that a military attack on the Iranian nuclear programme would not delay it by a significant time period if, as expected, the Iranians anticipated a military attack, made preparations for a rapid recovery and, after it, withdrew from the NPT and undertook a post-attack crash programme to acquire nuclear weapons.In fact, if Iran devoted maximum effort and resources to building a nuclear weapon post military strikes, it could achieve this in less than two years.
An attack on Iran's nuclear facilities could have the preverse effect of increasing their timetable for developing nuclear weapons. Assuming that the military strikes do not destroy all of Iran's facilities and their nuclear supplies, Iran will be able to overtly embark on a crash course towards nuclear weapons with more international support.