U.S. sanctions move angers Iran, Russia sees threat to nuclear deal

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By Fredrik Dahl and Steve Gutterman VIENNA/MOSCOW (Reuters) - A breakthrough agreement to end the standoff over Iran's nuclear program appeared to face its first major difficulty on Friday with Russia warning that expanding a U.S. sanctions blacklist could "seriously" complicate its implementation. Russia, which, along with the United States, is among the six world powers that negotiated the November 24 interim accord with Tehran, echoed Iran's criticism by saying Washington's decision violated the spirit of the deal. The United States on Thursday blacklisted additional companies and people under existing sanctions intended to prevent Iran from obtaining the capability to make nuclear weapons.