(1) It depends on too many factors that are not under our control. Pak uses nukes for deterrence. They are definitely not meant to be used. But there's no guarantee there's nobody who will use nukes, because there's a good chance the destruction of their armed forces will imply they will also lose control of their nukes. My point is if we are planning on destroying the PA completely, that straightaway implies Pak will no longer exist. So someone has to test this theory, and we are unlikely to do that at this time.
(2) This can be done without resorting to war. All we have to do is launch punitive strikes that cannot be covered up. And the destruction wrought has to be enough that the Pak public will bay for blood, either Indian or PA's, for inaction or failure. PA has swallowed up huge amounts of public money, and if they cannot demonstrate the ability to protect Pakistan, then that creates a situation for them that they may not be able to recoup from. But we have no need to destroy PA in order to achieve this.
We are waiting for a lot of things, not just the S-400.
