Iraqi women walk towards a poster depicting images of Shi'ite Iran's Supreme Leader Ayatollah Ali Khamenei at al-Firdous Square in BaghdadThe United States and long-time arch-foe Iran agree on at least one thing ahead of Tuesday’s negotiations on a long-term nuclear deal – reaching an agreement will be very difficult, if not impossible. Iran’s Supreme Leader Ayatollah Ali Khamenei, the man who has the final say on all matters of state in the Islamic Republic, declared again on Monday that talks between Tehran and six world powers “will not lead anywhere. Hours later a senior U.S. administration official also played down expectations, telling reporters in the Austrian capital that it will be a “complicated, difficult and lengthy process” and “probably as likely that we won’t get an agreement as it is that we will. Their remarks came on the eve of the first round of high-level negotiations since an interim deal was struck on November 24 under which Tehran curbed some nuclear activities for six months in return for limited sanctions relief to allow time for a long-term agreement to be hammered out. More