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TEHRAN, IRAN - APRIL 3: Iranians hold a celebration in capital Tehran after negotiators took a significant step Thursday toward the framework for an agreement aimed at keeping Iran's nuclear program peaceful. On Thursday evening, Iran and the P5+1 group of nations (the U.S., China, France, Russia, the U.K. and Germany) unveiled a preliminary framework for talks aimed at curbing Tehran's nuclear program. (Photo by Fatemeh Bahrami/Anadolu Agency/Getty Images)

TEHRAN, IRAN - APRIL 3:  Iranians hold a celebration in capital Tehran after negotiators took a significant step Thursday toward the framework for an agreement aimed at keeping Iran's nuclear program peaceful. On Thursday evening, Iran and the P5+1 group of nations (the U.S., China, France, Russia, the U.K. and Germany) unveiled a preliminary framework for talks aimed at curbing Tehran's nuclear program. (Photo by Fatemeh Bahrami/Anadolu Agency/Getty Images)