Over the years, Pakistan has used four techniques to maintain effective parity. First, they have spent a disproportionate amount of their government revenues on defence. Second, they have been helped enormously by external allies; in the 1950s and 1960s and again in the 1980s, it was the United States, currently, it is the Chinese. The allies have provided the Pakistani military substantial weapons systems and equipment at throwaway rates. Third, Islamabad has used what is called “sub-conventional” means, aka terrorism, to undermine India. Fourth, they have developed a nuclear weapons force to protect themselves against any Indian retaliation to their covert war.