US reviewing extension of Iran diplomacy after ‘tangible progress’
Talks likely to be extended beyond July 20 deadline; Kerry declines to address Zarif's proposal in public, criticized swiftly by US lawmakers.
Iran's FM Javad Zarif (L) holds a bilateral meeting with US Secretary of State John Kerry (R) in talks over Tehran's nuclear program in Vienna, July 14, 2014.(photo credit: REUTERS)ByMICHAEL WILNER
