Iran, US agree final nuclear deal may be unreachable

US to deal harshly with violators of Iran sanctions Iran ready for long term deal: FM

VIENNA - The United States and 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 US 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.

Despite his scepticism about the chances for a lasting deal with the West, Khamenei made clear Tehran was committed to continuing the negotiations between Iran and Britain, China, France, Germany, Russia and the United States.

"What our officials started will continue. We will not renege. I have no opposition," he told a crowd in the northern city of Tabriz on Monday to chants of "Death to America".

If successful, the negotiations could help put an end to years of hostility between Iran and the West, ease the danger of a new war in the Middle East, and open up vast new possibilities for Western businesses.

During a decade of on-and-off negotiations with world powers, Iran has rejected allegations by Western countries that it is seeking a nuclear weapons capability. It says its nuclear work is for power generation and medical purposes.

Tehran has defied UN Security Council demands that it suspend uranium enrichment and other sensitive activities, leading to a crippling web of US, EU and UN sanctions that has severely damaged the oil-producing nation's economy.

Khamenei's decision to pursue negotiations with the six powers in spite of the scepticism he shares with his hard-line supporters, diplomats and analysts say, is a result of Iran's worsening economic conditions.