Why are international laws against war difficult to enforce?

International laws against war are difficult to enforce primarily because the international system lacks a sovereign authority capable of compelling states to comply with legal norms. Unlike municipal law, which operates within a state under a central government, international law functions among states that prioritize their own sovereignty and domestic jurisdiction.12

Key factors contributing to this enforcement challenge include:

• Absence of Supranational Authority: There is no global executive body with the power to enforce laws above the level of individual states.13
• Political Disagreement: Enforcement mechanisms, such as those outlined in the United Nations Charter, often fail because major powers frequently disagree on political grounds, leading to the vetoing of collective action.14
• Sovereignty and Nonintervention: States are highly protective of their sovereignty. The UN Charter itself includes provisions that generally prohibit intervention in matters essentially within a state's domestic jurisdiction, creating legal and political friction when the international community attempts to intervene in conflicts.32
• Lack of Universal Participation: The effectiveness of institutions like the International Criminal Court is compromised because several major global powers have not joined, limiting the court's reach and authority.5

Ultimately, for legal norms to be effective, they must align with underlying political realities, which remain deeply divided by power politics and competing national interests.13