Iran doesn't want security assurances...
...which is good, because the Bush Administration is likely not interested in offering them either. Said Iran's top nuclear negotiator Ali Larijani:
"Iran does not need these kinds of condescending guarantees and has a good enough capacity to defend itself."
It seems Mohammad ElBaradei was the only one who thought this was a good idea.
Mohammad al-Baradei, head of the International Atomic Energy Agency, urged Washington on Monday to put security assurances on the table with Iran as it had done in similar talks with North Korea.
Just like North Korea. We all know how that turned out.