ISLAMABAD (Reuters) Pakistan will confront its reputation as a proliferator head-on this week when the prime minister addresses a global summit in Washington aimed at keeping nuclear weapons out of the hands of terrorists. Arch-rival India and other critics could however undercut Pakistan by reminding the world of its nuclear smuggling, highlighting the Taliban insurgency and fanning fears of a Muslim country in chaos where militants could seize atomic material. India will demand restrictions imposed on Pakistans nuclear programme, said Shahid-ur-Rehman, a journalist and author of Long Road to Chagai, a book on Pakistans nuclear programme. Their main stress will be on securing Pakistans nuclear assets by the world, he told Reuters. Pakistans efforts will be to counter that and convince them that our National Command Authority, which oversees the countrys strategic assets, is very effective and that our nuclear assets are safe and secure. Prime Minister Yousuf Raza Gilani will speak at the summit after meeting President Barack Obama on Sunday. There are no plans for Gilani and his Indian counterpart, Prime Minister Manmohan Singh, to meet, although the leaders of the nuclear-armed rivals may have a brief encounter. Obama called the Nuclear Security Summit to reach a common understanding on the threat posed by nuclear terrorism and an agreement on steps to secure all loose nuclear material within four years to stop it falling into the hands of groups such as al-Qaeda. US Secretary of State Hillary Clinton says the April 12-13 gathering of 47 nations is possibly the largest assembly of world leaders in the United States since 1945. Because of Pakistans so-called past, that there was proliferation from Pakistan and that Pakistani scientists had met Osama bin Laden ... there will be pressure on Pakistan, said Rehman, referring to reported meetings involving two retired Pakistani nuclear scientists before the September 11 attacks. America and the Wests biggest concern is that weapons of mass destruction should not fall into extremists hands and, in this case, they seem to be tacitly pointing at Pakistan. India and the anti-Pakistani lobby have always tried to exploit that and they will try to do it again. Pakistan dismisses that concern, calling it speculative. I do not see any possibility, whatsoever, of Pakistani material, or nuclear technology falling into the wrong hands, a spokesman for the Foreign Ministry, Abdul Basit, told Reuters. India knows full well how secure Pakistans strategic assets are. Obama says hes confident about the security of Pakistans arsenal, but India isnt so sure. Currently, both India and Pakistan have an agreement to share prior information about new missile tests they plan to carry out, as well as an agreement to share details about each others nuclear facilities and their safety on a periodical basis. There is a lot of mistrust as India keeps on receiving reports of secret (nuclear) installations in Pakistan, and it believes that Islamabad is not sharing all its details, said Naresh Chandra, Indias former envoy to Pakistan. India is aware, however, of Pakistans importance to US and NATO forces in Afghanistan, so it doesnt expect much American intervention between the two on nuclear issues, Chandra added. There is more at stake in Washington than nuclear one-upmanship between old rivals. Pakistans economy has been hammered by energy shortfalls and high on its wish-list is a civilian nuclear deal with the United States like the one India received under President George W Bush. It has been repeatedly rebuffed by the United States - although lately more gently - and media reports in Pakistan suggested China may step up and help with civilian nuclear technology. That would likely make India even more suspicious because of its own rivalry with China. The two fought a war in 1962. Washington also would like Pakistans help in curtailing Irans nuclear programme, although there appears little chance of that. According to the Stockholm International Peace Research Institute, India has between 60-70 warheads while Pakistan has about 60. Neither India nor Pakistan is party to the Treaty on the Non-Proliferation of Nuclear Weapons that Obama hopes to strengthen.