"The summit would deliberate on the crucial issue of threat to nuclear security caused by nuclear terrorism," Prime Minister Narendra Modi, who is attending the summit, said in a statement ahead of his departure from New Delhi.

"Leaders would discuss ways and measures through which to strengthen the global nuclear security architecture, especially to ensure that non-state actors do not get access to nuclear material," he said.

With US Secretary of State John Kerry saying, “India has a very important role to play with respect to responsible stewardship of nuclear weapons and nuclear materials", a lot of focus during the summit will be on what New Delhi has to say.

After attending a leaders-only thematic dinner on 'Nuclear security threat perceptions' hosted by US President Barack Obama today, leaders of 53 nations and four international organisations will sit across three working sessions tomorrow to discuss nuclear security and various aspects associated with it.

"India expects that the summit would contribute further to raising high level awareness of the threat of nuclear terrorism and the need to strengthen international cooperation against terrorists and nuclear traffickers," Amandeep Singh Gill, joint secretary (disarmament and international security affairs) in the ministry of external affairs, said in a media briefing here on the summit.

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