In this photo released on twitter account of Iran's Foreign Minister Mohammad Javad Zarif , Zarif, left, shakes hand with Iranian scientist Massoud Soleimani prior to leaving Zurich, Switzerland for Tehran, Iran, Saturday, Dec. 7, 2019. Iran and the U.S. conducted a prisoner exchange Saturday that saw a detained Princeton scholar released for an Iranian scientist held by America, marking a rare diplomatic breakthrough between Tehran and Washington after months of tensions. (Javad Zarif twitter account via AP)
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