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If these assassinations were intended to substantially set back progress in Iran’s nuclear program, they proved largely counter-productive. After each assassination, Tehran’s nuclear program appears to have accelerated and has now reached the point where it will have accumulated enough enriched uranium to manufacture one or two nuclear bombs within as little as two weeks if it decided to do so, according to most experts.

Source: Was the assassination in Iran another Israeli effort to sabotage JCPOA? – Responsible Statecraft