Recommend this analytical article to you as it does a nice job in summarizing the dangers associated with the long standing hostility between Muslim Pakistan and Hindu India. The article’s focus is on the nuclear capabilities of each but the article, and other past articles referred to in its text, paint a complete picture of their shared history, from a united India under British Imperial rule thru the years that have followed. If you have any interest and are having difficulty accessing any of the referred articles please let me know and I will get them for you.

How India's Failure to Deter Pakistan Could Spark Nuclear Conflict
How India’s Failure to Deter Pakistan Could Spark Nuclear Conflict