A gas flare on an oil production platform in the Soroush oil fields is seen alongside an Iranian flag in the Gulf July 25, 2005. REUTERS/Raheb Homavandi/File Photo

VIENNA, March 6 (Reuters) – Talks to revive Iran’s 2015 nuclear deal with world powers were mired in uncertainty on Sunday following Russia’s demands for a U.S. guarantee that the sanctions it faces over the Ukraine conflict will not hurt its trade with Tehran.

Moscow threw the potential spanner in the works on Saturday, just as months of indirect talks between Tehran and Washington in Vienna appeared to be headed for an agreement, […]

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By Donato