International coalitions can effectively address global challenges by leveraging collective power and expertise to tackle issues like climate change, security threats, and humanitarian crises. By combining resources and knowledge, coalition members can respond more robustly than individual nations, fostering collaborative solutions and sharing best practices. These alliances also enhance diplomatic relations, providing platforms for dialogue and conflict resolution. However, forming effective coalitions requires aligning diverse national interests and overcoming political differences, necessitating strong leadership and commitment to mutual goals in a rapidly changing global landscape.