"The Return of the Third World
Marina Ottaway Web Commentary, May 26, 2010
Turkey, Brazil, and Iran negotiated a deal whereby Tehran would turn over 1200 kilograms of low-enriched uranium to Turkey, to be exchanged for rods of more highly enriched uranium suitable for medical purposes. The repudiation of the deal by the United States was swift and uncompromising: Secretary Clinton announced that the United States had reached an agreement with Russia and China on the imposition of new, harsher sanctions on Iran, and that the sanctions were the U.S. answer to the deal."
More:The Return of the Third World - Carnegie Endowment for International Peace