Realism sufficiently explains military and security issues, but underestimates the influence of global connection to peace and stability; It also ignores the influence of non-state actors. Liberalism, on the other hand, focuses on global business economics and culture, but this is still not enough to explain the problems of terrorism, ethical conflicts, sexism, and international conflicts. This is because each international theory only focuses on a single perspective, so there is no single international theory that can explain all international phenomena. In other words, there will not be a single theory capable of providing the best compass for formulating foreign policy in each country..