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A person has three kind of friends
1- his friend
2- his friend's friend
3- his enemy's enemy
In case of Pakistan and India, first two categories will take time to bear fruit, but third one will work instantly. We need a common enemy and a BIG one, a real big threat, that make us stand together whatsoever. For example Godzillas emerge from the pacific ocean in dozens, or a strange creature appears from the desert that eat human flesh or an army of vampires that suck human blood, or aliens have come that turn man into wood. A real complication and matter of life and death and survival.
If, for a moment, we imagine that the particular giant threat has come. Why wait for some external one, when salvation lies within. Leave past behind and start work together from now on.