Iran says it has some practical proposals with regard to reviewing the 40-year-old Nuclear Non-Proliferation Treaty (NPT) which should be considered by the International Atomic Energy Agency (IAEA). He blamed that IAEA has failed to fulfill its main obligations over the past four decades.Talking to reporters before embarking on his trip to New York this morning, Iranian President Mahmoud Ahmadinejad said nuclear weapons have posed the single greatest threat to the world for more than sixty years. According to Iranian channel Press TV, he charged that under the pretext of nuclear non-proliferation, certain countries exert political pressure on those merely seeking to pursue peaceful enrichment activities. The conference, which will run from May 3 to May 28, aims to monitor the global progress in fulfilling disarmament obligations set out in the NPT.