I can give you a point of view of how if this war with India and Pakistan will be if it occurs.
Kashmiris in Kashmir side with Pakistan, they will forbid Indian troops to enter and probably start forming independent militias to do the attack in the north, along with China who if harmed by Indian troop or its interests/presence will retaliate.
2nd thing to realize, although this is a Majority Hindu government in India, the minorities in India will have their way of retaliation by forming their own independent militias and attacking from within, especially some Indian Muslims.
So, India will be occupied from the north from the Kashmir ordeal, then internally with independent militias fighting from within.
Now, here is the troubling part for India, right now Pakistan is fighting a war within and the afghan border right? They are fighting terrorists that kill civilians within their cities and what not, what do you think will happen when India does any sort of assault ? Those terrorists would probably leave political pakistani matters alone, stop attacking pakistani cities, and then push themselves onto India.
Now here is the other thing, many Muslim independent militias in Bangladesh are also anti-Indian, they will sound their voice and attack from that region as well as they will see this as a major opportunity to do so as they have in the past.
So you got all these things going on, now the final part will be, Pakistan will then attack strategically along its border. Most likely not bombing Muslim populated areas as they see those as an advantage.
If Nuke is initiated, then there will be a world problem.
For your information, Pakistan has many many allies around the world. It has been active in the war against terrorism.