US Secretary of State Hillary on Thursday warned Iranian President Mahmoud Ahmadinejad that he will fail if he tries to disrupt the UN nuclear Non- Proliferation Treaty (NPT) review conference. 'If President Ahmadinejad wants to come and announce that Iran will abide by their non-proliferation requirements under the NPT, that would be very good news indeed and we would welcome that,' Clinton told reporters. 'But if he believes that by coming, he can somehow divert attention from this very important global effort ... then I don't believe he will have a particularly receptive audience,' she said before the conference opens Monday. 