Answer:
Neorealism
Explanation:
Neorealism is a theory of international relations that emphasizes that power is the most important tool.
It further argues that in neorealism or structural realism, the anarchic ordering principle of the international structure is decentralized, meaning there is no formal central authority; every sovereign state is formally equal in this system. These states act according to the logic of egoism, meaning states seek their own interest and will not subordinate their interest to the interests of other states.