World leaders are gathering at the UN Security Council for a summit exclusively focused on nuclear weapons.
President Obama will chair the historic meeting, the first time a US president has done so since the council was set up in 1946.
He is expected to ask nuclear nations to scrap their deadly arsenals.
Today’s meeting comes as Moscow signalled it might be ready to get tougher with Iran over its atomic programme.
The West is threatening a fresh wave of sanctions if Tehran refuses to comply.
UK Foreign Minister David Miliband said: “We acknowledge the recent measures taken by Iran regarding its cooperation with the IAEA
and encourage Iran to cooperate further with the IAEA
to resolve the remaining issues which need to be clarified to exclude the possibility of military dimensions to Iran’s nuclear programme.”
US Secretary of State Hillary Clinton went on to say: “We want to see a serious effort by Iran to discuss the nuclear issue and we are also looking for Iran to recognise that they are at a turning point, they have a choice to make”.
The US’ draft resolution will also urge all countries that have not signed the 1970 nuclear Non-Proliferation Treaty to do so in an effort to rid the world of the atomic threat.