Iran's Zarif says signficant progress in nuclear talks, no agreement on solutions yet
"We are working on setting parameters of the issues that will led to drafting the final deal by end of June."
President Barack Obama, Vice President Joe Biden, and White House aides receive an update from Secretary of State John Kerry and Secretary of Energy Ernest Moniz via teleconference in Lausanne(photo credit: WHITE HOUSE)ByREUTERS
