The twentieth century was marked by the proliferation of security regimes, and collective security in particular. Under a collective security arrangement, all states at either a regional or global level agree to resolve their disputes peacefully, collectively oppose acts of aggression, and actively defend those who are victims of such aggression. It is based on the premise that security is indivisible, that is, each state’s security is intricately tied to the security of others, and no nation can be completely secure so long as the territory, independence, and populations of other states are seriously threatened. However, over the past several decades, ethnic conflicts, civil wars, guerrilla insurgencies, and other forms of internal violence have dramatically increased, even as large-scale interstate wars have declined. In addition to these sources of instability and conflict, political repression and extreme human rights abuses by governments against their populations (particularly genocide and ethnic cleansing) often generate massive refugee flows, illegal arms trafficking, and the rise of paramilitary guerrilla armies, all of which could disrupt neighboring states and regional stability. Thus, the concept of security adopted by international and regional regimes over the past few decades has expanded from the threat and use of force for deterrence and enforcement to include nation- and state-building, peacekeeping, and peace-making.
Next to national defense, energy security has become a primary issue for the survival and wellbeing of both developed and developing nations. A review of the literature shows how concerns for energy security acquired a new dimension after the collapse of the Soviet Union in 1991, when the Western powers and a weakened Russia competed for the control of the Eurasia region and its energy resources. Research has also focused on how different countries have developed a variety of strategies for securing their energy supply. Energy security literature can be split into three general sections: neoclassical economics and public choice, bureaucratic politics and public administration, and political economy. Scholars have also explored regime theory, resource conflict, and the relationship between national energy security and foreign policy. In the case of the United States, four major challenges in foreign policy issues related to energy security can be identified: “building alliances, strengthening collective energy security, asserting its interests with energy suppliers, and addressing the rise of state control in energy.” These challenges require eight specific foreign policy responses from the U.S. government, two of which constitute the core relationship between energy security and foreign policy making: “candor and respect” for the producer countries, and foreign policies that promote the stability and security of suppliers.