VIENNA - UN Secretary-General Ban Ki-moon on Thursday urged all parties in nuclear talks between Iran and six world powers to show flexibility in order to finally resolve a 12-year dispute over Tehran's atomic program. The negotiations, under way in Vienna, are deadlocked, officials say, and will probably have to be extended due to a number of sticking points, such as limits on Iran's uranium enrichment and the speed at which sanctions on Tehran would be lifted. 'The Secretary-General calls on all participants to demonstrate the necessary flexibility, wisdom and determination to bring the negotiations to a successful conclusion that meets the concerns and interests of all sides,' Ban's press office said in a statement. 'He is convinced that such an accord can contribute to the strengthening of regional and international peace and security at a time when global cooperation is needed perhaps more than ever,' the statement said, adding that Ban hoped a deal would 'restore confidence in the peaceful nature of Iran's nuclear program.'
