If war between Pakistan and India happens then...
1. What kind of war it would be?
2. How much fuel and ammunition and resources both of the countries have in order to fight a conventional war?
3. How long can the war last if only the armies fight?
4. Is there chance of a nuclear war? Obviously the one who will be defeated will use nukes as a last resort.
5. So if nuclear war happens, then how much destruction can both of the countries do to each other?
6. How much population of both of the countries will be left?
7. What are the key areas of both Pakistan and India where nukes can be used by the respective countries?
8. How much infra structure can be destroyed with all the nukes delivered successfully?
9. Is anti missile "umbrella" technology effective? What percentage is the chance of it's effectiveness in protecting from enemy nukes and missiles?
10. How advanced is India in Anti Missile Technology?
11. Does Pakistan have such a technology?
12. Can Pakistan ballistic missile system defeat India's anti missile umbrella?
13. What precautions can citizens take in order to be safe if nuclear war is unleashed?
14. What is the hukam of Islam in regards to this kind of scenario?
15. In such a situation should Muslims do astaghfar and other amaal while waiting for their death from either blast or radiation?
16. Or should citizens come out of their homes and try to run away from areas which are effected by nuclear blasts?
17. Will all the buildings and area destroyed by Indian and Pakistani nukes and missiles?
18. Or will it destroy some areas while killing people through radiation in the atmosphere?
19. What will be the situation of the whole world if World Nuclear War takes place? It is said that USA and RUSSIA have so many nuclear weapons and weapons more dangerous than Hydrogen bomb that they can destroy the planet earth a good number of times? So will Allah make these nukes in effective before the arrival of hour?
20. Has any alim done any work on the fiqh and rulings of Shariah about our code of conduct in times of a nuclear war which will be a kind of grand scale war which the world will witness for the first time?
If any alim has done work on this matter then it will be appreciated if anyone could share the link
You are free to ask any more questions which I have left due to my lack of knowledge.
Answers to these very important questions will be appreciated.

