I doubt Pakistanis will ever allow them to just "move north". A global war would ensue, where everyone would try to defend their southern borders from the intr

I doubt Pakistanis will ever allow them to just "move north". A global war would ensue, where everyone would try to defend their southern borders from the intruders and try to "go north". And billions of deaths will happen out of necessity, since "the north" can't sustain enough food production for 7-8bn of people. And since many would die anyways, every nuclear power will make sure to use their nukes to destroy the ones trying to come from the south and to break up north. In the end, it would be a nuclear war between the USA and Russia trying to use the situation and extend the full control over the Arctic.