With 191 parties, it is one of the most widely supported arms control agreements in history. Despite its reach, a small number of countries have never signed it citing reginal thrats and security concerns.

What is Nuclear Non-Proliferation Treaty and why these three countries never signed? EXPLAINED

Meanwhile, neither India nor Pakistan have signed the NPT, and have gradually built up their nuclear arms.

Which countries have nuclear weapons and who tops the list in wake of Israel-Iran war? Check how many nukes India possess

The re-implementation of the Iran nuclear agreement shouldn't be contingent on determining whether Tehran has complied with its Treaty on the Non-Proliferation of Nuclear Weapons (NPT) responsibilities, said the White House on Friday.

White House says no link between Iran nuclear deal and IAEA probes under NPT

India must sign the Non-Proliferation Treaty(NPT) to gain entry into the Nuclear Suppliers Group, China said Thursday, asserting that "patient negotiations" were required for New Delhi's admission into the group as there is no precedent for the inclusion of non-NPT countries.

India must sign NPT to gain entry into NSG, patient negotiations required: China

No doubt North Korea is the challenge in terms of nuclear blackmailing but the bigger global challenge is yet to come in the form of nuclear weapons possessed by terrorists.

Is nuclear blackmailing going to be a new normal?

India has long been trying to secure the membership of the 48-member group but China's stance on New Delhi not being a signatory of NPT has been blocking its bid to secure the sea

China says not opposed to any country's NSG membership

India's reaction came after China said NSG membership can't be a 'farewell gift' by the Obama administration to India

Not seeking NSG membership as 'farewell gift': India

The deal, to be signed on Friday,comes against a backdrop of growing security concerns in the South China sea over China's military presence

Japan, India to ink controversial nuclear deal

In Tuesday's meeting, China conveyed to Indian diplomats that it would like an 'open and transparent process' for granting membership to NSG

China wants 'non-discriminatory' formula for NSG membership

Says group cannot admit countries that have not signed NPT, is backed by 10 other countries

China remains adamant that India cannot join NSG

It had earlier said that the group was yet to decide on the inclusion of new members

China unrelenting on opposition to India's NSG bid?

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