International relations influence the UPSC syllabus by encompassing significant global issues, including diplomacy, security, and economic policies. Given the increasingly interconnected world, candidates must grasp key international frameworks, treaties, and conflicts. Topics like India's foreign policy, regional organizations, and global geopolitical dynamics are often included. This understanding is crucial for developing policies in the civil service that affect national and international contexts. A sound knowledge of international relations thus equips UPSC aspirants with the required competencies for addressing real-world challenges in governance.