Einstein once said that the definition of insanity is "doing the same thing over and over again and expecting different results." The current sanctions strategy in Iran is exactly what took place in North Korea. Just when the effect of sanctions was beginning to take hold, the regime announced an agreement, only to be broken at a later time. In the case of North Korea, this usually happened right before their brutal winter.
Repeating the same mistakes Clinton made with North Korea will not change the outcome with Iran. Six months from now, it will be springtime in Tehran.