By Fredrik Dahl and Steve Gutterman VIENNA/MOSCOW (Reuters) - A breakthrough agreement to end a standoff over Iran's nuclear program appeared to face its first major difficulty on Friday with Russia warning that a U.S. sanctions move could "seriously" complicate its implementation. Russia, which along with the United States is among the six world powers which negotiated the November 24 interim accord with Tehran, echoed Iran's criticism by saying Washington's sanctions decision violated the spirit of the deal. Moscow's statement came after diplomats said Iran had interrupted technical talks with the six nations in Vienna over how to implement the agreement, under which Tehran is to cap its nuclear program in return for limited sanctions easing. Several Western diplomats insisted the inconclusive outcome of the December 9-12 expert-level discussions in Vienna should not be seen as a sign that the political deal hammered out nearly three weeks ago was in serious trouble.
Crushing disappointment tainted the final day of Nelson Mandela's lying in state Friday, with tens of thousands of mourners unable to say their personal farewell to the anti-apartheid icon. Friday was the last opportunity to view the body of South Africa's first black president in Pretoria, before it is transported to his boyhood village of Qunu for burial on Sunday.