State sovereignty and national security are mutually reinforcing: sovereignty gives a state the authority to protect its territory and political system, while national security preserves the independence needed to exercise that authority. However, security policies can also restrict sovereign choice or weaken a government's legitimacy.
The Connection
Sovereignty has both external and internal dimensions. External sovereignty means that a state is legally independent and protected from intervention by other states. Internal sovereignty means that it exercises effective authority within its territory.
National security protects territorial integrity, political institutions and independent decision-making. Russia's full-scale invasion of Ukraine in February 2022 threatened Ukraine's external sovereignty because it challenged Ukraine's borders and right to determine its own political future. Ukraine's military defence therefore protects both national security and sovereignty.
| Dimension | Connection to national security | Contemporary example |
|---|---|---|
| External sovereignty | Defence prevents foreign actors from controlling territory or policy. | Ukraine has defended its territory against Russia since 2022. |
| Internal sovereignty | Security institutions maintain effective authority and enforce law. | Armed groups attacked police stations and the main airport in Haiti in 2024, weakening state control. |
| Voluntary cooperation | States may accept international commitments to strengthen security. | Finland joined NATO in April 2023, exercising sovereignty while accepting collective-defence obligations. |
A realist perspective emphasizes state survival, territorial control and military power. A liberal perspective argues that sovereignty can be strengthened through interdependence, alliances and international institutions. Finland's NATO membership demonstrates that cooperation does not automatically eliminate sovereignty.
The common misconception is that every national security policy strengthens sovereignty. Excessive surveillance, emergency powers or arbitrary detention may undermine rights and reduce legitimacy, weakening the state's authority even if immediate security improves.
Exam Technique
Security is an HL topic area and can be examined through Paper 3 (HL only; guide p. 66). Build a clear causal chain: identify the threat, explain how it affects internal or external sovereignty, apply a contemporary case, and evaluate whether the response strengthens security without undermining legitimacy.
