Current NSG membership rules require a state to sign nuclear NPT before joining this exclusive club.
A draft proposal for accepting new members into the Nuclear Suppliers Group paves the way for India's entry but leaves Pakistan out, says a US-based arms control organisation.
The Arms Control Association (ACA), Washington, also warns that relaxing membership rules will undermine non-proliferation.
Last week, the US media reported that Rafael Mariano Grossi, a former chairman of the NSG, had prepared a two-page document, explaining how a non-NPT state, like India and Pakistan, could join the group. Rafael Mariano Grossi was acting on behalf of the current chairman, Song Young-wan of South Korea, and his document enjoys a semi-official status, Dawn reported.
To prevent India from blocking Pakistan from joining the NPT, Rafael Mariano Grossi's draft note proposes that "one non-NPT member state should reach an understanding not to block consensus on membership for another non-NPT member state".
But ACA's Executive Director Daryl Kimball warns that "Pakistan still has grounds to object to the formula outlined by Grossi".
He explains that the document will require Pakistan to meet the same criteria for membership as India "but, to engage in civil nuclear trade with NSG states, it would have to win a separate NSG exemption from the full-scope safeguards requirement".
India is seeking membership of the NSG on the strength of the fact that it is already doing business with NSG members.
The 48-nation NSG is a nuclear technology control organisation formed in 1975 in response to India's first nuclear weapons test, which used plutonium produced with nuclear technology from Canada and the US. The NSG seeks to prevent similar future misuses.
Current NSG membership rules require a state to sign the nuclear Non-proliferation Treaty (NPT) before joining this exclusive club. India remains one of only three countries, with Israel and Pakistan, never to have signed the NPT.
Earlier this year, India formally applied for membership and was followed by Pakistan. The US, and a host of other powerful western nations, back India's application, but China and half a dozen other nations are blocking India's membership, which requires a consensus of all members.
India hoped to join the group during NSG's last plenary session, held in Seoul in June this year, but the meeting ended without taking any decision on New Delhi's application.