And, if India and Pakistan (or Iran and Israel, or Kiev and Russia, or...) decide to lob nukes at each other, then it won't matter, right.
Discussion
Among those, only Russia, Pakistan and India posses working nukes. And among those most won't even launch, because they're not maintained. And then nukes are mostly smaller tactical nukes to be used on the battlefield and not to wipe out whole cities. So it's all bullshit when someone starts threatining to nuke the planet.