It took quite literally a bomb to shift the big powers into concerted action at the United Nations Security Council against a long-defiant, boastfully nuclear-capable North Korea. What will it take for Europe, America, Russia and China to agree on the sort of sanctions that might oblige a nose-thumbing but not yet nuclear-armed Iran to obey the council's demand to stop enriching uranium and messing with plutonium, from which its own future bombs could be made?
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