Tehran  - Iranian President Mahmoud Ahmadinejad on Monday rejected nuclear talks with world powers and their September deadline for negotiations.

"Our stance is very clear: we only talk to the International Atomic Energy Agency about the nuclear issue," Ahmadinejad told a press conference.

"I don't know anything about a deadline, either, and believe that this term is no longer compatible to today's literature," Ahmadinejad added.

The president reiterated that talks with world powers would solely be focused on tackling "global challenges."

The six countries involved in the nuclear dispute with Iran - the five permanent members of the UN Security Council Britain, China, France, Russia and the United States plus Germany - called on Iran to enter talks before the end of September or face tougher sanctions.

"The world powers should respect the Iranian position and we hope that they do but even if they do not, we will be prepared for both options (cooperation and confrontation)," said Ahmadinejad.

The president said Iranian would propose to the world powers a commitment to "global challenges" on the basis of equality and justice.

He said Iran wanted to amend the structure of the United Nations and the Security Council, to not allow a few countries to dominate issues of global concern. (dpa)