National security refers to the requirement to maintain the survival of the nation-state through the use of economic, military and political power and the exercise of diplomacy.
Measures taken to ensure national security include:
- using diplomacy to rally allies and isolate threats
- maintaining effective armed forces
- implementing civil defense and emergency preparedness measures (including anti-terrorism legislation)
- ensuring the resilience and redundancy of critical infrastructure
- using intelligence services to detect and defeat or avoid threats and espionage, and to protect classified information
- using counterintelligence services or secret police to protect the nation from internal threats.
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