EU countries, wary of being punished by Washington for breaking sanctions, have so far proved unable to deliver the promised economic advantages to Iranians
US measures on all trade of Iranian iron, steel, aluminum and copper come hours after Islamic Republic partially left nuclear deal, threatened to step up uranium enrichment
Move allows Russia and European nations to continue work at nuclear sites without incurring US penalties; 2 waivers relating to heavy water and uranium enrichment not extended
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