Regional alliance against who???
More importantly what do these two countries have to share??? Both are poor countries with high level of poverty, unemployment and extremist population. The only difference is Pakistan has brighter future within a next decade or so, thanks to China. Also Pakistanis keep trying to match India so they ll put up a good show ( as evident from past) . On the other hand the great Persian empire is dead, ruled by fanatics. Engaged in several proxy wars in middle east and fighting with Saudias for regional dominance, risking the well being of its own people.