Zamir Akram, Pakistan's former permanent representative at the UN in Geneva and envoy at the Conference on Disarmament, said this while speaking at a seminar on the International Nuclear Order, jointly organised by the Strategic Vision Institute (SVI) and Konrad Adenauer Stiftung.
The Dawn quoted Akram as saying that the "chances of India gaining entry into NSG are virtually nil".
He claimed China would not allow India to join the 48-nation NSG because this would affect its nuclear cooperation with Pakistan.
Other than China, he said there are some countries that are upset by the "double standards" being shown in India's case, and are calling for an approach based on criteria.
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This is the second time in a month that a senior official involved in the country's nuclear affairs has dismissed India's chances of NSG membership.
Last month, advisor to the National Command Authority, retired Lt Gen Khalid Kidwai, said at a conference that "We also have friends in NSG who would not let it happen" referring to India's bid.
Aziz also spoke over telephone with Argentina Foreign Minister Susana Malcorra and sought her country's continued support for NSG membership.
Malcorra apprised Aziz that NSG Chair Argentine Ambassador Rafael Mariano Grossi has fully briefed her on the issues involved.