After three days of meetings in Geneva the Iran nuclear talks end without a breakthrough but with signs of progress says European Union foreign policy chief Catherine Ashton.

(SOUNDBITE) (English) EUROPEAN UNION FOREIGN POLICY CHIEF CATHERINE ASHTON , SAYING:

"A lot of concrete progress has been made but some differences remain."

Iranian Foreign Minister Mohammad Javad Zarif was even more optimistic.

(SOUNDBITE) (English) IRANIAN FOREIGN MINISTER MOHAMMAD JAVAD ZARIF , SAYING:

"I think we are all on the same wavelength, and that's important and that gives us the impetus to go forward when we meet again next time. Sop, actually I think we had a very good three days, very productive three days and it is something we can build on and move forward."

U.S. Secretary of State John Kerry also sounded an optimistic note.

(SOUNDBITE) (English) U.S. SECRETARY OF STATE JOHN KERRY, SAYING:

"There is no question in my mind that we are closer now as we