International relations significantly shape national security policy by influencing a country's strategic interests and diplomatic engagements. Nations often formulate their security strategies based on global threats, alliances, and historical contexts. For instance, a country may align with others through treaties, participate in multilateral organizations, or engage in intelligence-sharing to bolster its defense capabilities. Additionally, events such as terrorism, conflicts, or economic sanctions can lead to immediate shifts in security priorities. Ultimately, the interdependence of countries in the global arena necessitates agile national security policies that reflect both international norms and national interests.