VIENNA — Iran is signaling that it will cooperate this weekend with UN experts visiting the country to investigate alleged nuclear weapons activity it has steadfastly denied, a potentially promising step in an inquiry that has been stalled for six years.
But with Iran still denying any attempt to make such arms, the investigators must tread carefully.
As the UN’s International Atomic Energy team arrived in Tehran on Friday, the state IRNA news agency cited Iranian atomic energy organization spokesman Behrouz Kamalvandi as saying his country is ready to answer all questions raised by the UN agency.
IRNA did not elaborate, and such pledges have been made before. However, a senior diplomat from an IAEA member nation cited a ranking Iranian official as telling him and other senior diplomats that Iran was specifically ready to engage on the weapons program suspicions with the UN experts.
The diplomat demanded anonymity because he wasn’t allowed to discuss his private meeting with the Iranian official.
Iran has denied any interest in nuclear weapons since the IAEA started to focus on its atomic activities. Specific attempts to investigate the alleged weapons program first launched in 2007 have made little progress.
Iran appears to be suggesting it will go into detail on the big topic, an issue it has previously said was not in the agency’s purview or was based on doctored intelligence. If successful, it will be the first of what the agency hopes will be a series of increasingly deeper investigations into the nuclear weapons allegations.
The United States and its allies are pushing the IAEA for progress. At the same time, too much pressure on Iran at the weekend talks between the agency and Iranian officials could push Tehran back into its shell of secrecy.
That, in turn, may hurt parallel talks between Iran and six world powers seeking to eliminate fears Tehran may use its nuclear programs to make weapons. It has agreed to curb its atomic activities in exchange for sanctions relief.
Those talks are off to a promising start with both sides planning to meet Feb. 18 to try to translate an interim deal into a permanent agreement. But Olli Heinonen, who formerly headed the IAEA’s Iran inquiry, says that a final deal can be sealed ‘‘only if uncertainties over Iran’s military nuclear capability are properly addressed.’’
Another diplomat said that the IAEA team was carrying a list of alleged weapons-related experiments that it would present to the Iranian negotiating team for discussion. Among them, were:
■ Indications that Iran has conducted high explosives testing and detonator development to set off a nuclear charge, as well as computer modeling of a core of a nuclear warhead.
■ Suspected preparatory work for a nuclear weapons test, and development of a nuclear payload for Iran’s Shahab 3 intermediate range missile — a weapon that can reach Israel.
■ Information that Iran went further underground to continue work on nuclear weapons development past 2003, the year that US intelligence agencies believe such activity ceased.