What is the key difference between the liberal theory of collective security and the realist idea of deterrence?

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The main difference between liberal theory of collective security and realist idea of deterrence is that in the liberal theory, states are more likely to view their interests as common interests rather than individual interests. Liberal theory assumes that states have shared values and goals and that every state wants to uphold international law and order. On the other hand, realist theory assumes that every state pursues its own interests and that anarchy in the international system makes it difficult to cooperate. In the realist idea of deterrence, states act based on military and economic power to deter any potential threat to their security.

What Is the Key Difference Between the Liberal Theory of Collective