Relevant excerpts from this document:

As a responsible nuclear weapon State, India has a policy of maintaining a credible minimum deterrence based on a no-first-use posture and non-use of nuclear weapons against non-nuclear weapon States.

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Without prejudice to the priority India attaches to disarmament, India supports the immediate commencement of negotiations in the Conference on Disarmament on a fissile material cut-off treaty in accordance with CD/1299 and the mandate contained therein, which remains the most suitable basis for negotiations.