  Not all realists, however, deny the presence of ethics in international relations. The distinction should be drawn between classical realism—represented by such twentieth-century theorists as Reinhold Niebuhr and Hans Morgenthau—and radical or extreme realism. While classical realism emphasizes the concept of national interest, it is not the Machiavellian doctrine “that anything is justified by reason of state” (Bull 1995, 189). Nor does it involve the glorification of war or conflict. The classical realists do not reject the possibility of moral judgment in international politics. Rather, they are critical of moralism—abstract moral discourse that does not take into account political realities. They assign supreme value to successful political action based on prudence: the ability to judge the rightness of a given action from among possible alternatives on the basis of its likely political consequences.