There is no doubt that mullahs are very manipulative just by looking what they have done and how they played on nuclear issue, shows us their real intention:
In a statement posted on the Expediency Council's Web site in May 2006, Rowhani, who was Iran's top nuclear negotiator under Khatami, explained that Tehran had for years been working very deliberately and very incrementally to complete the fuel cycle. That objective was established in 1989, the year Khamenei became supreme leader. Centrifuges, other necessary equipment, and nuclear technology were then brought into Iran during Rafsanjani's presidency, and the centrifuges were upgraded (thanks to reverse engineering) under Khatami. Throughout, Rowhani explained, it was the supreme leader who set the policies.
Although at the end of Khatami's presidency Khamenei ordered the suspension of uranium-enrichment activities, he is unlikely to do so again. In a speech to university students earlier this year, Khamenei explained why not: "Today, whoever demands a temporary suspension from us, we tell them: 'We had a temporary suspension once already, for two years. . . . What was the use? . . . Suspension turned into something sacrosanct that Iran had no right whatsoever to touch! . . . ' And, at the end of it all, they said, 'Temporary suspension is not enough; you have to close down the nuclear business altogether'!" Even if Khamenei committed to suspending Iran's nuclear operations again, such work might not actually be halted. "It is true that we accepted suspension, but not in order to close things down," Rowhani told Etemaad newspaper in November 2007 of Khatami's agreement to halt nuclear activities in 2004. "During the suspension, we built the centrifuges, we built the Arak plant. . . . Whatever was incomplete, we completed under the shadow of suspension. The West was demanding a suspension so that we would close things down, but we suspended things in order to complete the technology." And the Iranian government was ready to go further, even under the reformist Khatami. "For my own part," Rowhani recalled, "I said at several meetings with the officials in charge of the technical side, 'Whenever you are ready for enrichment, let us know and we will break the suspension.'" The Latter-Day Sultan, Power and Politics in Iran By Akbar Ganji from Foreign Affairs, November/December 2008
The question that still remains unanswered is how Obama is going to deal with Iran?