Iran is already effectively a "latent" nuclear weapons state, question remains how long it would take them to breakout
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Regardless of the outcome of the nuclear talks, it is highly likely that Iran will retain a latent nuclear capability for the foreseeable future. A latent nuclear capability is the possession of the technical capacity, including the ability to indigenously produce weapons- grade fissile material, to build nuclear weapons on short order.3 There are a number of states in the world, including Japan, a close ally of the United States, with such a capability.
According to this definition, Iran is already a latent nuclear power. Secretary of State John Kerry has is often referred to as Iran’s “breakout” timeline because once Iran produces enough fissile material for one bomb, the United States can no longer physically prevent Iran from building nuclear weapons. For the purpose of preventing Iran from becoming a nuclear power, therefore, the timeline to producing one bomb’s- worth of fissile material is by far the most important.