well few things to refresh you
1. its not just pakistan who has professional strategists in this field
2. its not just pakistan who has anty radiation assets like drones and decoys to fool enemy air defences and there countermesures
3.India has a dedicated space programme for this very purpose + active help from israelies and russians and some say even USA
4.India already has a very large and extended air defnce network with its own special forces to protect it from sabotage and arial and ground based multi band and multi layered networks
5.india also happen to have a very strong multi layered SAM network
go and google about indian radars and sam network that is avilable on net and thats just a part of the bigger picture and as for S400 we are yet to buy it ask OP why he started the thread on presumptions