Iran sanctions are not working.
The Obama administration is toasting its success in putting the economic screws to Iran:
'After two years of failed efforts to entice Iran with diplomatic carrots, the Obama administration is quietly toasting successes at using economic sticks. A series of U.S. and international sanctions imposed over the past year have slowly undermined Iranâ??s ability to conduct trade by targeting the countryâ??s access to international banking, insurers and transportation companies. Like Maersk, some firms voluntarily cut ties with Iranian companies that U.S. officials say are front operations for the Revolutionary Guard.At the same time, the United States has backed international efforts to lower global petroleum prices, bringing the collateral benefit of stripping Iran of revenue that it has used to offset the economic costs of sanctions.
The measures have not slowed Iranâ??s race to make the enriched uranium needed to produce a nuclear weapon. But current and former U.S. officials say the sanctions are having unparalleled success in creating significant hardships for key Iranian industries. [Emphasis mine]
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Ultimately, if North Korea can see their ramshackle nuclear program through in the teeth of some of the world's toughest sanctions, it's hard to see how sanctions will ultimately stop Iran.