What theories are in realism in international relations theory?

Realism, as a very basic definition, is a theory based on the following ideas:

Sovereign states are sacrosanct; they are the major players in global relations.

Sovereignty must not be violated by interference from outside a state.

A state's primary duty is to look after its own interests. This means developing a strong economy, which can support a strong military to ensure the security of the state.

Economic realism (mercantilism) involves protectionism on a zero-sum basis.