The United Nations Security Council (UNSC) had passed a US-backed resolution urging all nations to sign the NPT,
Prime Minister said, "Global non-proliferation regime has not succeeded in preventing nuclear proliferation."
Dr Singh said India was committed to voluntary unilateral moratorium on nuclear testing, clearly indicating that it would not sign the two treaties.
"Global non-proliferation, to be successful, should be universal, comprehensive and non-discriminatory and linked to the goal of complete nuclear disarmament," Dr Singh said while inaugurating the three-day International Conference on 'Peaceful Uses of Atomic Energy'.
"India is proud of its non-proliferation record and is committed to global efforts for preventing the proliferation of all weapons of mass destruction," he added.
Earlier, India made it clear that it would sign the NPT only if the all states, including US, Russia and China , fulfill their obligations under the treaty.