Iran nuclear talks rocked by Russian demand for sanctions exemption

Moscow seeks guarantees regarding trade with Iran that would undermine west’s response to Ukraine invasionRussia has been accused of trying to take the Iran nuclear deal hostage as part of its wider battle with the west over Ukraine, after it threw a last-minute spanner into plans for an agreement to lift a swathe of US economic sanctions on Tehran.After months of negotiations in Vienna, a revised deal was expected to be reached within days under which US sanctions would be lifted in retur