If only Pakistan could punch in it's own weight class life would have been so much easier for everyone but no it has to constantly be a maverick, do things none expected nor was logically possible with the resources it had.
It is this Icarus like nature of Pakistan which makes it so dangerous and instils fear and loathing in India which has been an habitual underachiever.
@Oscar - Have you ever stopped to consider what drives the core Indian psychology with respect to Pakistan which is reflected in all it's doctrines? It is vary sense of admiration mixed with
envy and gloating at the same time. We would like Pakistan to be our Nepal or it's errant cousin Sri-Lanka but refuses to oblige us.
Now as for NFU or FU - these are strategic mind-games, India retains the option for all out nuclear retaliation in event of Nuclear attack on it's assets irrespective of the degree of attack which makes it inevitable that Pakistan would like it's first punch to knock India down, India knows this and in this age of global satellite coverage it would never let Pakistan land it's first punch resulting in invalidation of NFU.
But in deterrence sphere it works beautifully to discourage the use of tactical weapons as Pakistan knows the cost will be too high and unless it is ready to use the strategic nukes and risk annihilation it might as well grin and bear it.
So you see NFU serves its purpose of maintaining peace and at the same time leaving option open for limited skirmishes for balancing purposes but when push comes to serve it is just a voluntary declaration not worth the piece of paper it is written on.
Regards