Iranian Foreign Minister Javad Zarif, left, Head of Iranian Atomic Energy Organization Ali Akbar Salehi, second left, Special Assistant to Iranian president Hossein Fereydoun, second right, and Iranian Deputy Foreign Minister Abbas Araghchi wait for the start of a meeting with Britain, Russia, China, France, Germany, European Union and the U.S. officials at the Beau Rivage Palace Hotel in Lausanne, Switzerland Monday, March 30, 2015, during Iran nuclear talks. Negotiations over Iran’s nuclear program are entering a critical phase with differences still remaining just two days before a deadline for the outline of an agreement. (AP Photo/Brendan Smialowski, Pool)