http://english.aljazeera.net/news/americas/2010/05/2010541621950827.html Iran dominates nuclear arms summit Iran has taken centre stage at the opening of a month-long debate at the United Nations on how to stop the spread of nuclear weapons. UN Security Council powers met on Tuesday to discuss ways to punish Tehran as a final document detailing ways to achieve goals of checking the spread of nuclear weapons was being drafted. Mahmoud Ahmadinejad, the Iranian president, set a defiant tone at the opening of the conference reviewing the Nuclear Non-proliferation Treaty (NPT) in New York on Monday, saying the US "has never respected any of its commitments" on nuclear weapons. He said Washington had offered not "a single credible proof" to back claims that his country was developing nuclear weapons. Iran insists it is enriching uranium for purposes of devloping nuclear energy for civilian use, but the West suspects it is seeking to develop a nuclear bomb. Al Jazeera's Kristen Saloomey in New York said: "We've seen sympathies for comments from Mahmoud Ahmadinejad from countries who themselves are pursuing nuclear technology for peaceful purposes and want to develop their nuclear reactors." in depth But she added that the US, which released previously classified statistics on the size of its nuclear arsenal as Ahmadinejad delivered his speech, had been praised for the move. The defence department said the US has 5,113 nuclear warheads in its stockpile. US officials have said they will be looking to isolate Iran and to produce an unofficial document calling for stricter enforcement of the NPT, which requires signatories to abandon nuclear weapons. The document could be signed by the overwhelming majority of signatory countries, but because it requires a consensus of all parties - including Iran - it would be highly unlikely to censure Tehran and could block consensus, analysts said. Our correspondent said the "document ... calls on Israel to sign up and join the NPT. Israel is widely believed to have nuclear weapons but has not confirmed or denied their existence". "By signing up to the NPT, they would be required to do that. Of course, other countries as well are being asked to do that - India and Pakistan are also nuclear states who have not joined the NPT," she said. Tit-for-tat Ahmadinejad, who accused the US of not only using nuclear weapons but also threatening to use them, drew sharp criticism from Hillary Clinton, the US secretary of state. She told delegates Iran was "flouting the rules" of the nonproliferation treaty with its suspect uranium enrichment programme. In video 'Better way' on Iran urged "I hope that we can reach agreement in the Security Council on tough new sanctions," Clinton told reporters. "I believe that is the only way to catch Iran's attention." The NPT is formally reviewed every five years at a meeting of all 189 treaty members - all the world's nations except India, Pakistan, Israel and North Korea, all of which either have confirmed or are believed to have nuclear weapons. Tehran has refused to abandon its enrichment programme and now faces the prospect of UN-backed sanctions as a result of its defiance in the face of international pressure. Ban Ki-moon, the UN secretary-general, said over the weekend that more progress needs to be made in disarmament efforts. Those efforts have been boosted by new pledges from the US and Russia in recent months. Ban also said Iran's and North Korea's nuclear programmes were "of serious concern to global efforts to curb nuclear proliferation".