India embarked on its journey to become a full-fledged nuclear state after the clash with China in 1962. Followed by the china nuclear test in 1964. At the time of PM Indira Gandhi India tested its first-ever Nuclear test, Pokharan I in 1964 and called "Peaceful Nuclear explosion". After the pressure from the international state, India abandons its Nuclear test for almost two decades. At the time of PM Atal Bihari Vajpayee and in the leadership of Dr. A. P. J. Abdul Kalam India again tested its second nuclear test, Pokharan-II in 1998. It indicates that India is fully capable of a built nuclear weapon and can be installed in its fast pacing missiles. After some sanctions from the U.S.A and pressure by them and as a responsible country introduced its NFU policy 'No first Use' policy. That it would not carry any nuclear attack on the non-nuclear country and at first glance on the nuclear country. It shows a responsible state who developed nuclear weapons for its only defense not for threat or acquiring any country land. The NFU promise thus went alongside credible minimum deterrence (CMD).
CMD doesn't bound any country to attack another country by nuclear. A small deterrence by an enemy can give rights to India to attack heavily or punitive to the enemy country. A small or low magnitude attack by any country can alert India Nuclear warheads and gives the right to a full-fledged nuclear attack on that country.
There are some provisions to conduct a nuclear attack and ultimately it's in the hand of the country PM. Nuclear warhead headed under the Nuclear command and controlled by the cabinet committee on security.
Why does India need to re-look at its 'NFU' policy?
Scenarios are not the same as in the '90s our neighboring countries like Pakistan use militants to disturb the peace in the region. CMD came into the existence after the attack at parliament in 2001 and the Mumbai attack in 2008. From that time Pakistan's forces would not try to disturb the peace of the nation but they regularly send their militants to halt the development in the region.
In 2013, Shyam Saran convener of the NSA board said " India will not be the first to use a nuclear weapon but if it is attacked with such weapons (the chemical also) then India attack heavily and could damage its counterpart massively".
A nuclear attack on Pakistan is also not a good choice. Both countries are packed with a nuclear weapon and can destroy each other large no. of population and no politician would wish to. Instead of a nuclear attack, India should solve conflicts by dialogue or by international pressure or take stringent action against militants.
India should take pre-emptive action to counter Pakistan's nuclear weapon. India has the ability to destroy Pakistan's nuclear weapon on land (and sea also). It protects both countries to enter into nuclear war.
India is not the same as back in the '90s or early 21st century. Now India can take bold actions to protect its sovereignty. India demonstrates its power in the Balakot Air strike and shows its potential to everyone.
One more attack by Pakistan can encourage PM Modi to take such kind of action and shut down Pakistan's nuclear capability and gives a strong message to them.