SWITZERLAND-IRAN-US-NUCLEAR-POLITICS

(L to R) US Under Secretary for Political Affairs Wendy Sherman, US Secretary of State John Kerry, US Secretary of Energy Ernest Moniz and British Foreign Secretary Philip Hammond wait for a P5+1 meeting at the Beau Rivage Palace Hotel March 29, 2015 in Lausanne. AFP PHOTO / FABRICE COFFRINI (Photo credit should read FABRICE COFFRINI/AFP/Getty Images)