TEHRAN (Reuters) - Iran sees little point in staying in the Non-Proliferation Treaty, a senior official said on Monday. The comments by Ali Larijani, the influential conservative speaker of parliament, underlined deteriorating relations between Iran and world powers, after a brief diplomatic rapprochement two months ago, seeking a peaceful solution to a long-running standoff over Irans disputed nuclear program. I believe that their moves are harming the NPT the most ... Now whether you are a member of the NPT or pull out of it has no difference, Larijani told a news conference, alluding to the global pact banning development of nuclear weapons. This decision (new enrichment sites) was the result of the recent (IAEA) resolution, and Irans government sent a strong message, said Ali Akbar Salehi, head of Irans Atomic Energy Organisation, quoted by state broadcaster IRIB. Iran does not want to leave the NPT, Ali Akbar Salehi told Reuters on Monday. Our spiritual leader says that to obtain nuclear weapons is a sin - if we wanted to obtain nuclear weapons we would leave the Non-Proliferation Treaty, Salehi told Reuters through an interpreter. We do not want to leave the NPT. Salehi was speaking after a briefing with Russian Energy Minister Sergei Shmatko who was on a visit to the Bushehr nuclear power plant, which a Russian state company is helping to build. Top Iranian officials have repeatedly said Iran has no intention of leaving the NPT, under which its nuclear sites are subject to IAEA inspections, or use enrichment to produce fuel for nuclear weapons, which it says violate the tenets of Islam. Analysts also believe Iran would think twice before quitting the NPT since such a move would betray nuclear weapons ambitions and could provoke pre-emptive attack by Israel and possibly the United States. It could take sanctions-bound Iran, which has problems obtaining materials and components abroad, many years to equip and operate 10 new plants, strategic analysts say. Salehi said Tehran would not violate its international commitments, an allusion to basic IAEA nuclear safeguards. But a hardline newspaper editor, appointed by Supreme Leader Ayatollah Ali Khamenei, asked in an editorial whether it was time for Tehran to withdraw from the NPT. Larijani said there was still room for diplomacy. It would be useful for them also to use this diplomatic opportunity to let Iran work in the framework of the IAEA and international supervision to assure them that Irans activities are peaceful, he said. Of course they are free to choose another method and Iran will act accordingly. Meanwhile, Foreign Minister Manouchehr Mottaki lashed out at the UN atomic watchdog on Monday, accusing it of implementing the law of the jungle. A defiant Mottaki said Tehran will continue enriching uranium, the most controversial aspect of its nuclear programme. Mottaki said enriching uranium was Irans right as it has been an NPT member for nearly four decades.