ANKARA (Reuters) - European Union foreign policy chief Catherine Ashton said on Sunday it would be "difficult and challenging" to reach a long-term nuclear deal with Iran, as diplomacy intensifies before talks between Tehran and world powers on March 18.
Ashton arrived in Tehran on Saturday for a two-day visit -the first by an EU foreign policy chief since 2008 - during which she said a wide range of issues, including bilateral ties and regional conflicts, will be discussed.
