Iran's Foreign Minister Ali-Akbar Salehi said that Iran's nuclear establishments are open to experts of all countries, the state IRIB TV website reported on Thursday.

Iran has been among the rare countries who have been transparent about their nuclear activities and have worked under the watch of the International Atomic Energy Agency (IAEA), Salehi said upon his arrival from Astana, Kazakhstan, here on Wednesday.

He invited the nuclear experts of all the countries especially those of G5+1 (consisting of the five permanent members of the UN Security Council, namely the United States, China, Russia, Britain and France, plus Germany) to visit Iran's nuclear establishments, said the report.

Iran's foreign minister referred to the trilateral talks of Iranian, Russian and Kazakh presidents in Astana and said that presidents Mahmoud Ahmadinejad and Dmitry Medvedev stressed need for solving Iran's nuclear issue through diplomacy and negotiations, the official IRNA news agency reported on Thursday.

Russian officials said Wednesday that Iranian President Mahmoud Ahmadinejad has told them Tehran is prepared for closer cooperation with the IAEA.

"We heard a reassurance from the Iranian president that additional steps will be made to ensure greater transparency of the Iranian nuclear program as part of contacts between Tehran and the IAEA," Russian Foreign Minister Sergei Lavrov said after a meeting between Russian President Dmitry Medvedev, Ahmadinejad and Kazakh President Nursultan Nazarbayev.

Salehi also said "the president expressed hope that the negotiations with the G5+1 would continue," according to IRNA.

In January, six world powers wrapped up crucial nuclear talks with Iran in Istanbul but failed to reach any agreement on the Iranian nuclear program.