International security significantly impacts national policy by necessitating responses to global threats. A nation's security concerns often dictate strategic priorities, including military spending, diplomacy, and alliances. Policymakers must balance national defense with other domestic issues, which can shape policy agendas. For example, heightened concerns about terrorism or cyber threats may lead to increased surveillance measures or military interventions. The interplay between national security and foreign relations can also drive economic policies, as nations invest in technologies and partnerships that bolster their security presence in the international arena.