Arms control and international law are two:

Question

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Arms control and international law are often seen as idealist approaches to peace and security, emphasizing the importance of cooperation among states and adherence to agreed-upon norms and rules in order to prevent conflict and promote stability. Realist approaches, by contrast, tend to focus more on issues of power, security, and self-interest, and may be more skeptical of the effectiveness of arms control and international law in achieving sustainable peace. Just war doctrine and collective security action are related concepts but not directly tied to arms control and international law.

Arms Control and International Law Are Two