President Obama and President Rouhani know what action they must take to test their hopes. May they have the courage and wisdom to do so.
William Luers, a former U.S. ambassador to Venezuela and Czechoslovakia, is director of the Iran Project.
Thomas Pickering was U.S. undersecretary of state for political affairs from 1997 to 2000 and ambassador to the United Nations from 1989 to 1992.
James Walsh is an expert in international security and a Research Associate at the Massachusetts Institute of Technology’s Security Studies Program .