As far as realism is concerned, states work towards solely increasing their own power in relation to that of other states while considering that the world is a dangerous place and the only way to attain certainty is to have power. When realism is considered, there is the perception a nation, which is influential, should always do better than those competing against it which are relatively weaker while the most vital form of power which can be relied on is military power(Baylis and Smith, 2001, p. 4). Realism considers the primary interest of a nation to be self-preservation and therefore a nation should look for influence and should be in a position to protect itself at all times. The international system makes different states employ military might and war and even though leaders are capable of being moral, they are not supposed to let their ethical concerns be a source of guidance for their foreign policy.Politicians have always been practicing realism for as long as there has been an existence of states and most of them as well as other scholars during the Cold War looked at international relations through a realist perspective. The United States and the Soviet Union did not trust each other and they both looked for allies that would assist them in safeguarding their interests as well as increasing their political and military command outside their borders.When considering liberalism, the emphasis is placed on the fact that the broad ties existing between states have made it harder to identify the interest of a particular nation while they have also decreased the worth of military power (Brown, 2001, p. 22). Liberalism is a concept that came up in the 1970s when some scholars were of the opinion that realism had been outmoded and the escalating globalization, enhancement in the communication technology industry as well as growing international relations were not in a position to depend on simple power politics to make decisions on issues.