Those talks are aimed at defusing tension over Iran's nuclear program that has led to increasingly tough Western sanctions on Iran, including an EU oil embargo from July 1, and created fears of a war in the region.
If Iran does not agree to give the IAEA immediate access to Parchin before the Moscow talks, it would be a sign that Tehran "continues to believe it is in a relative position of strength," said Bruno Tertrais of the Strategic Research Foundation.
The United States said this week it doubted whether Iran would give the UN agency the kind of access to sites, documents and officials it needs.
"I'm not optimistic," Robert Wood, the acting US envoy to the IAEA, told reporters on the sidelines of a meeting of the UN agency's governing board. "I certainly hope that an agreement will be reached but I'm not certain Iran is ready."
His skepticism was reinforced by defiant remarks by Tehran's envoy to the IAEA, who accused the UN body on Wednesday of acting like a Western-manipulated spy service and said that Iran's military activities were none of its business.During the course of Ahmadinejad's meeting with his Chinese counterpart, the Iranian president expressed hopes that the IAEA negotiations would help ease tension, adding that his negotiators would make an earnest effort maintain contacts between all sides. Chinese President Jintao told Ahmadinejad his country is committed to overseeing a resolution to the Iranian nuclear issue through dialogue and cooperation, Xinhau reported.