“One for all, all for one” is a:

The phrase “One for all, all for one” reflects a collective security system, where states commit to mutual defense, as seen in alliances like NATO. Studying this highlights its role in international stability, the challenges of coordinating defense commitments, and its impact on global security. It also offers insights into how alliances deter aggression, providing lessons on fostering cooperative security frameworks to ensure peace and collective defense globally.