The Palais Coburg in Vienna is the venue for talks it's hoped with resolve the international row over Iran's nuclear ambitions.<br/> <br />Delegations from Iran and six world powers are hoping to make headway.<br/> <br />Iran's Supreme Leader is said to have given carte blanche for Iranian negotiators to provide guarantees the country's nuclear programme is peaceful.<br/> <br />The question now is whether the crisis over Ukraine will spill over because of the rift between Russia and the West.<br/> <br />The six world powers involved are the U.S. France, Germany, Britain, China and Russia.<br/> <br />Diplomats say there's no sign yet that the worst East-West confrontation since the Cold War will damage the search for a deal to end the Iran nuclear dispute.<br/> <br />There was no indication of such a spill over two weeks ago during expert-level talks.<br/> <br />Since then the U.S. and E.U have imposed sanctions on Russian and Ukraine officials over Crimean secession moves
