Foreign policy plays a crucial role in national security by determining how a nation interacts with other states. It influences defense strategies, crisis management, and alliances, ensuring that a country can protect its interests and maintain stability. A strong foreign policy can preempt threats, foster international cooperation, and contribute to global peace. In contrast, poor foreign policy choices may lead to conflicts, isolation, and vulnerabilities, thereby undermining national security. Ultimately, the effectiveness of foreign policy is often a reflection of a nation's priorities and ability to navigate complex global dynamics.