VIENNA (Reuters) - Offering immunity or an easing of the sanctions pressure may be the only way - if there is one at all - to coax Iran to end years of stonewalling a U.N. watchdog investigation into suspected nuclear weapons research in the Islamic state. Any such initiative would likely need to come from world powers as part of a broader diplomatic thrust to defuse the dispute over Iran's nuclear program, leaving the investigation by the U.N. atomic agency dependent on how those talks develop. ...
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