REPUBLIKA.CO.ID, VIENNA - The UN nuclear watchdog hopes to persuade Iran in talks on Saturday to finally start addressing long-held suspicions it has worked on designing an atomic bomb, a test of whether ties really are thawing under the Islamic state's new president.

The International Atomic Energy Agency has made it clear it now wants Iran to end what the West sees as years of stonewalling the IAEA's investigation into alleged nuclear bomb research by the country, which denies any such activity.

Diplomats are cautiously optimistic that the team of senior IAEA inspectors will return from the meeting in Tehran - which may run into Sunday - able to show at least some progress in gaining Iran's cooperation with the investigation.

However, they said the IAEA may tread carefully to avoid upsetting the delicate building of rapport at a time when Iran and six big powers are due to start separate, high-stakes talks on a broader settlement of the decade-old nuclear dispute.

The UN agency may therefore try to begin with getting Iran to clarify questions about some of the less sensitive aspects of the IAEA's inquiry into what it calls the "possible military dimensions" (PMD) to Tehran's nuclear program. This probably means that the IAEA's long-sought access to the Parchin military base, where it believes explosives tests relevant for nuclear bombs took place a decade ago, may have to wait a while longer.

The IAEA wants Iran to clarify suspected activities in a range of areas of potential application to developing atomic bombs, including computer calculations and experiments that could be of use for any nuclear test. Tehran has rejected the accusations of weaponization-related work as forged and baseless, while saying it will cooperate with the IAEA to clear up any "ambiguities".

The February 8 meeting comes 10 days before Iran and the world powers, building on a landmark interim deal struck in November, start negotiations on a long-term agreement on Tehran's nuclear aspirations that would avert the threat of a Middle East war.

Western diplomats hope those talks will lead to Iran scaling back its nuclear program sufficiently to deny it the capability to assemble a nuclear weapon any time soon. The IAEA's investigation is focused on the question of whether Iran sought atomic bomb technology in the past and, if it did, to determine whether such work has since stopped.

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