The Iranian authorities have also proposed "discussing the issue of sanctions and frozen assets before signing any agreement

Iran has threatened to impose tolls on shipping, while US demands that Iran hand over its highly enriched uranium may be deferred

DUBAI, May 23 (Reuters) - Iran's top negotiator, Parliament Speaker Mohammad Baqer Qalibaf, told Pakistani army chief Asim Munir during talks in Tehran on Saturday that the U.S.…