See it's nothing like that Chinese looking Actors cant be casted or language barrier.
People from north east can be easily casted with some prosthetics n they can show Chinese got training in many languages as they r agents or spies etc.
But we don't have so much issues with China. They r not in constant conflict with India. Their main focus is on Taiwan n Tibet n not ladakh n arunachal pradesh. So audience can't connect with it.
If someone is living in India they would easily understand that china n Pakistan cannot be compared. Only 1962 war was relevant n galwan valley war a minor one. But with Pakistan four major wars n many terrorist attacks. Daud ibrahim was hiding in Pakistan, Osama was found in Pakistan, they were first supporting Taliban etc. n many terrorist organisations from Pakistan r known to Indian people n from time to time they say something offensive to India. So there is lot of content which can be shown in movies.
Why don't Pakistan celebs question their army giving refuge to terrorists. Even many educated muslims who can differentiate between religion n nation dont like Pakistan because they ruin Muslim community image in India.
So it's obvious a war movie will have Pakistan army or terrorists villain.
1.4k