International System as the Category in the Science of International Relations

Abstract

The main aim of the article it to analize the category of international system in the science of international relations. The author discuss conception of system, definitions of the international system, their main parts, the classification international systems and category of international systems on the difference approaches theory of the international relations: behavioral, realism, liberal and constructivist. The author conclude that international system still being the key category in the science of international relations.