Thomas Mayr-Harting, left, head of the delegation of the European Union to the United Nations, shakes hands with Iran's U.N. Ambassador, Gholamali Khoshroo, at United Nations headquarters, Monday, July 20, 2015. The U.N. Security Council on Monday unanimously endorsed the landmark nuclear deal between Iran and six world powers and authorized a series of measures leading to the end of U.N. sanctions that have hurt Iran's economy. (AP Photo/Mark Lennihan), APTOPIX