first by commenting about pakistani disintegration you say china is prepared for the worst.even china is deeply aware of the possibility
Yep. China has prepped unified operating scenarios (coordinated action plans between the military, Foreign Ministry, state security, and overseas Chinese businesses) for events such as
1) Sudden regime change in a neighboring state (Pak, NK, Central Asia, Vietnam, Burma, Mongolia, Laos etc)
2) Thai-Cambodian War
3) Afghanistan security emergency
etc.
Most of these action plans involve ID'ing critical Chinese interests via overseas businessmen and state security, sealing the border with conventional forces, coordinating with the host governments (or de facto authorities) to guarantee the security of said Chinese interests, playing a double game between the sides with economic/political 'active measures' (cyber support, arms shipments, money to finance a civil war, etc) if said government or authority does not cooperate, and inserting drones and special ops if the situation continues to deteriorate. The target timeline in all these action plans is to guarantee the safety of said Chinese interests within 1-2 weeks, and then approaching the UN with a diplomatic solution.
a terrorist nuclear attack is hypothetical,but in case it happens there will be no pakistan.and if you say that what if an attack happens after disintegration of pakistan i have no answer.
my thanks to you,you have opened a new corridor which needs to be surveyed
Your welcome. Unfortunately, India does not have any easy way out of nuclear terrorism after the dissolution of a Pakistani state. That is why I stated if the only way India can secure its borders is to destabilize a nuclear-armed neighbor with organized religious extremism to the point of dissolution, then India has already lost the 'security game'.