Story time. There was a continuous 20 hr nonstop negotiation between Iran, Brazil and Turkey in May of 2010 which resulted in a deal that would have Iran ship its enriched Uranium to Brazil in exchange for fuel rods needed in medical research, which eliminates all the fears of Iran maybe enriching past 20%. This was Turkey's show all the way and they brokered the deal. In exchange for the fuel swap deal between Iran and Brazil under the auspices of UN, Turkey would make sure no global powers will impose sanctions on Iran. Behind closed doors, US assured Turkey that if Iran went with the deal, they would promise to not bring up sanctions at UN. This would've resulted in no more economic sanctions EVER and Iran would never be able to develop a Nuclear bomb. After the marathon negotiations, all three parties signed the deal and a secret handshake between Turkey and US. Probably one of the greatest international successes by non US entities.
Within hours, Hillary Clinton made a statement that the Iran-Brazil-Turkey deal was "not satisfactory". Few days later, the west imposed toughest economic sanctions on Iran yet and the deal went kaput. Welcome to US foreign policy. By the way, as the deal was on-going, Obama was at AIPAC.