International relations profoundly shape national security policies by determining a country's strategic interests, alliances, and threats. Diplomacy, military agreements, and international conflicts require governments to adapt their security strategies to protect national interests. A stable international environment may lead to cooperative policies, while tensions and conflicts can prompt heightened security measures, including military readiness and intelligence operations. National security decisions are thus influenced by a nation's relationships with other countries, addressing both challenges and opportunities on the global stage.