I recommend reading the June 1st Newsweek interview with El Baradei
Q: Had the Bush administration been more flexible, do you think it could have had a deal to freeze the Iranian enrichment program in its experimental phases?
El Baradei: There is no way you are able to deny them the knowledge. But if they do not have the industrial capacity, they do not have weapons. It is as simple as that. I have seen the Iranians ready to accept putting a cap on their enrichment [program] in terms of tens of centrifuges, and then in terms of hundreds of centrifuges. But nobody even tried to engage them on these offers. Now Iran has 5,000 centrifuges. The line was, "Iran will buckle under pressure." But this issue has become so ingrained in the Iranian soul as a matter of national pride.
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Q: You focus on actual nuclear material. But the Americans have supplied the IAEA with the documents in question. The Iranians insist they are fake and refuse to talk about them.
El Baradei: A lot is in documents which we cannot share with the Iranians because of the need to protect sources and methods. Iran says, how can I tell you if it is fake or authentic if I am not getting a copy? So in many ways it's like a merry-go-round.
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