Most states are likely to be friendly, non-threatening and peace-loving. But a few states may be hostile and aggressive and there is no world government to constrain them. That pose a basic and age-old problem of state systems: national security. To deal with that problem most states possess armed forces. Military power is usually considered a necessity so that states can coexist and deal with each other without being intimidated or subjugated. Unarted states are extremely rare in the history of the state system. That is a basic fact of the state system that we should never lose sight of Many states also enter into alliances with other states to increase their national security. To ensure that no great power succeeds in achieving a hegemonic position of overall domination, based on intimidation, coercion or the outright use of force, it is also necessary to construct and maintain a balance of military power. Security is obviously one of the most fundamental values of international relations Tiat approach to the study of world politics is typical of realist theories of IR (Morgenthau 1960). operates on the assumption that relations of states can be best characterized as a world in which armed states are competing rivals and periodically go to war with each other. The second basic value that states are usually expected to up hold is freedom, both personal freedom and national freedom or independence. A fundamental reason for having states and putting up with the burdens that governments place on citizens, such as taxes or obligations of military service, is the condition of national freedom or independence that states exist to foster. We cannot be free unless our country is free too: that was made very clear to millions of Czech, Polish,Danish, Norwegian, Belgian and Dutch citizens,as well as citizens of other countries that were invaded and occupied by Nazi Germany during the Second World War Even if our country is free we may still not be free personally, but at least