Strong evidence suggests that Iran’s nuclear program is intended to actually construct nuclear weapons, not merely to develop the capability to do so. If it is not stopped soon, Iran will acquire the capacity to build nuclear weapons, shield that capacity from possible attack, and ultimately sprint to construct nuclear weapons when it deems circumstances ripe. For Israel, Iranian capacity to build nuclear weapons constitutes an unbearable threat, especially given the possible future threat of Iran using nuclear weapons through proxies.
In any diplomatic solution, the P5+1 must insist on terms which will set the Iranians significantly back from their existing threshold capacity. Iran should be made aware that the diplomatic avenue is time limited, that sanctions begin to relax only when Iran demonstrates real cooperation and that the West is prepared to use force against Iran’s nuclear facilities as a last resort.
Failing to stop Iran through sanctions and diplomacy, backed by the credible threat of force, will leave Israel having to decide in the coming months whether to use a unilateral military option.