TEHRAN, Iran —  President Mahmoud Ahmadinejad said Monday Iran will neither halt uranium enrichment nor negotiate over its nuclear rights but is ready to sit and talk with world powers over "global challenges."

Ahmadinejad also said Iran will present a package of proposals for talks to the five permanent members of the U.N. Security Council plus Germany but rejected any deadline for such talks. He said the package would "identify challenges facing humanity ... and resolve global concerns."

But he said that "from our point of view, Iran's nuclear issue is over. We continue our work within the framework of global regulations and in close interaction with the International Atomic Energy Agency." But "we will never negotiate over obvious rights of the Iranian nation," he said.

Iran has repeatedly vowed it will never suspend enrichment work, saying it has every right under the Nuclear Nonproliferation Treaty to enrich uranium and produce nuclear fuel. The enrichment process can produce either fuel for a reactor or the material for a warhead.

"It is very clear that this (deadline) is incompatible with the Iranian nation's needs and direction today," Ahmadinejad told a press conference Monday. "Resolving global issues requires constructive interaction on the basis of justice and respect."

Ahmadinejad said Iran will continue to cooperate with the IAEA over regulations on safeguards on its nuclear sites, "but we will resist if the agency is influenced by political pressures."