"Iran developed a very sophisticated nuclear science and technological capability, which we are quite ready to share with ... neighboring countries and friendly countries in the region," the adviser, Mohammad Javad Larijani, said.

"We are ready to cooperate with them in this regard, while within the NPT." He was referring to the 1968 nuclear Non-Proliferation Treaty, which aims to prevent the spread of atomic weapons technology.

Iran was also willing to cooperate in the nuclear field with countries outside the region, like Brazil, he added.

Both Turkey and Brazil voted against a fourth round of UN Security Council sanctions on Iran over its nuclear program in June 2010.

The US, EU and their allies suspect Iran is trying to develop nuclear weapons and, along with the UN Security Council, have imposed sanctions to try to stop it from enriching uranium. But Tehran says its nuclear program is to generate electric power and refuses to halt it.