Iran freed four Americans including a Washington Post reporter on Saturday in a prisoner swap, as diplomats gathered to announce the lifting of international sanctions and bring the country of 80 million people back to the global economic stage.<br />"Implementation day" of the nuclear deal marks the biggest re-entry of a former pariah state into world commerce since the end of the Cold War.<br />The four held in Iran include Washington Post bureau chief Jason Rezaian, held since 2014 and convicted in Iran of espionage.<br />His case in particular has been a notable obstacle to a thaw in Iranian-US relations.
