Iran and world powers met in Vienna on Tuesday.

They're hoping to hammer in the coming months a final settlement on Tehran's disputed nuclear program.

(SOUNDBITE) (English) IRANIAN DEPUTY FOREIGN MINISTER, ABBAS ARAQCHI, COMING OUT OF OFFICE SURROUNDED BY MEDIA, SAYING:

"We just had a very good beginning. That was all. Thank you."

It's the first round of high-level talks since a breakthrough interim agreement in November.

That deal stopped a decades-long slide towards outright conflict.

But both sides are non committal about the outcome, including the spokesman for European Union Foreign Policy Chief Catherine Ashton, who's overseeing the talks.

(SOUNDBITE) (English) EU FOREIGN POLICY CHIEF CATHERINE ASHTON'S SPOKESMAN, MICHAEL MANN, SAYING:

"It's impossible for me to say now, at this point, what the result would be at the end of this particular round, I'm afraid."

Any deal needs the approval of Iran's Supreme Leader Ayatollah Ali K