Iran has been unable to withdraw much of the unfrozen oil revenue it was to receive under a November interim nuclear deal, a possible complication for efforts to end the decade long standoff over Tehran’s nuclear ambitions, The Wall Street Journal reported on Sunday, April 6th. 
The problems were outlined in interviews with nearly a dozen Western and Iranian officials and diplomats, bankers and lawyers with knowledge of the issue.
An estimated $100 billion in payments of Iranian assets have been frozen in foreign countries.