Six world powers wrapped up two days of talks with Iran on its nuclear program on Tuesday, December 7, agreeing to meet again in Istanbul next month.

Iranian President Mahmoud Ahmadinejad meanwhile called on the six — Britain, China, France, Germany, Russia and the United States — to lift international sanctions against his country if they want the talks to bear fruit.

Catherine Ashton, the European Union's top diplomat, described the Geneva talks as "detailed, substantive."

Joining Ashton and Jalili at the Geneva talks were officials from Britain, China, France, Germany, Russia and the United States at the Swiss UN mission building, calgaryherald.com reported.