WASHINGTON - Iran's top diplomat Mohammad Javad Zarif says Tehran has no interest in building an atomic bomb, despite Western powers' claims otherwise.

Zarif's comments, in a television interview due to be broadcast Sunday, when Iran engages in talks with the five permanent members of the United Nations Security Council plus Germany aimed at a grand bargain reducing in scope the Islamic republic's nuclear activities in return for sanctions relief.

"I will commit to everything and anything that would provide credible assurances for the international community that Iran is not seeking nuclear weapons, because we are not," Zarif told NBC's "Meet the Press" from Vienna, where the talks are taking place.

"We don't see any benefit in Iran developing a nuclear weapon."

Zarif rejected "calculations" suggesting the Shiite country would seek to develop nuclear weapons to guard itself against its Shiite neighbours.

"We need to go out of our way in order to convince our neighbours that we want to live in peace and tranquillity with them," he said.

"The politics of geography - the fact that we're bigger, the fact that we're stronger, that we're more populous, the fact that we have a better technology, the fact that our human resources is by far more developed than most of our neighbours - all of these provide us with inherent areas of strength that we don't need to augment with other capabilities."

Calling the principle of nuclear deterrence "simply mad," the foreign minister insisted that Pakistan was not considered stronger than Iran simply because it has nuclear weapons.

"The fact that everybody in the international community believes that mutual assured destruction - that is the way the United States, Russia and others seek peace and security through having the possibility of destroying each other 100 times over is simply mad," he added.

"I do not believe that you need to inculcate this mentality that nuclear weapons make anybody safe. Have they made Pakistan safe? Have they made Israel safe? Have they made the United States safe? Have they made Russia safe? All these countries are susceptible," Zarif said.

"Now you have proof that nuclear weapons or no amount of military power makes you safe. So we need to live in a different paradigm. And that's what we are calling for."

The deal sought by the latest round of talks is meant to quash for good concerns about the Islamic republic getting the bomb after more than a decade of failed diplomacy, threats of war and atomic expansion by Iran.

The deadline for an accord is July 20, when an interim agreement struck by foreign ministers expires, although this can be put back if both sides agree.