Neoclassical realism could be considered as an approach that seizes the middle-ground in realist perspective. Given the increasing importance of some domestic variables such as public opinion, civil society on foreign policy process, adding that the immaterial factors that have been mostly ignored by the other realist views, its inclination to combine “outside and inside” elements to establish a solid analytical framework for not only states’ foreign policies but also international politics in general, offers, without doubt, a promising prospect for the study of international relations in 21st century.