India adopted its nuclear Doctrine in 2003 the salient features of this Doctrine are as follows:

Building and maintaining a credible minimum deterrence.

A posture of no first use nuclear weapons will only be used in retaliation against the nuclear attack on Indian Territory or on Indian forces anywhere. 

Nuclear retaliation to a first strike will be massive and designed to inflict unacceptable damage. 

Nuclear retaliatory attacks can only be authorised by a civilian political leadership through nuclear command authority.

 Non use of nuclear weapons against non nuclear weapon States.

However, in the event of a major attack against India or Indian forces anywhere by biological or chemical weapons India will retain the option of retaliating with nuclear weapons.

A continuance of strict controls on export of nuclear and missile related materials and technologies participation in fissile material cutoff Treaty negotiations and continued observance of the moratorium on nuclear test.

Continued commitment to the goal of a nuclear-weapon-free world through global, verifiable and non-discriminatory nuclear disarmament.