There is no 123 if there is no Hyde Act. Hyde Act is the US law that facilitate the US to entre into the 123 agreement with India. I have gone through the Hyde Act, which any body can download from US gov. web site. As per the provisions of Hyde act the US President has to report to the congress even about the stock of fissile material India have for making bombs. It clearly states that US should ensure India's active participation in US global efforts including that to contain Iran. If any of this is violated the US is bound by the hyde act to pull out from the deal. And our great PM, Mukherji and Chidambaram says we will have indipendent policy in world affairs including that in case of Iran.