English By Michael Lipin, Siamak Dehghanpour, Payam Yazdian January 23, 2021 05:21 AM Share on Facebook Print this page WASHINGTON - Prominent Iran-based and Iranian diaspora critics of Tehran’s Islamist rulers have differing expectations about how far U.S. President Joe Biden will go to implement his promised new approach to dealing with Iran’s objectionable behavior. Biden, who took office on Wednesday, has vowed to use diplomacy in coordination with U.S. allies to try to rejoin the Joint Comprehensive Plan of Action, the 2015 deal in which world powers offered Iranian leaders sanctions relief in return for curbs on nuclear activities that could be diverted into weapons production.