New Delhi, Sep 24 - While the United Nations Security Council passed a resolution calling for universal adherence to non-proliferation treaty, India has reiterated it will not join the pact, which it terms discriminatory, as a non-nuclear weapon state.

The UNSC Thursday passed a resolution at a session chaired by US President Barack Obama, that called upon states that have not signed the NPT to join as non-nuclear weapons states, or pending that adhere to the norms of the treaty.

It also calls upon all countries to sign and ratify the Comprehensive Test Ban Treaty and support negotiations for a fissile materials control treaty.

A day before the resolution was taken up, India's Permanent Representative to the UN Hardeep Puri wrote to US Ambassador to the UN Susan Rice, who is also the President of UN Security Council, on India's position on the proposed meeting on nuclear non-proliferation and nuclear disarmament.

'India cannot accept calls for universalisation of the NPT. As India's Prime Minister stated in Parliament on 29 July, 2009, there is no question of India joining the NPT as a non-nuclear weapon state,' wrote Puri in the letter dated Sep 23, released by the Ministry of External Affairs here.

He further stated that India could not 'accept any obligations arising from treaties that India has not signed or ratified'. 'This position is consistent with the fundamental principles of international law and the law of treaties,' India's senior-most diplomat at the United Nations said.

He added that India will remain out of the NPT and continue to have nuclear weapons, unless the treaty was made more equitable. 'Nuclear weapons are an integral part of India's national security and will remain so, pending non-discriminatory and global nuclear disarmament,' said Puri.

At the same time, he noted that India had an 'unwavering commitment to global efforts for preventing the proliferation of weapons of mass destruction and their means of delivery'.

'These efforts are in India's interest as the infirmities of the non-proliferation regime have had an adverse impact on our security,' he said, referring to the proliferation of the A.