Objectives:
This study examines Japan's security policy evolution from post-World War II pacifism to its current assertive stance, analyzing historical context, key drivers, and challenges. It focuses on shifts under Prime Minister Shinzo Abe, exploring implications for regional stability and international relations, including the U.S.-Japan alliance and emerging security threats.

Methods:
The research employs a qualitative approach, combining comprehensive literature review with multiple theoretical frameworks (neorealism, constructivism, securitization theory, alliance theory). It incorporates historical and comparative analyses to contextualize Japan's security posture within regional dynamics.

Results:
Japan's security policy has transformed significantly, driven by China's military modernization, North Korea's nuclear program, changing regional dynamics, and evolving U.S.-Japan alliance expectations. Key reforms include constitutional reinterpretation allowing limited collective self-defense, establishing the National Security Council, increased defense spending, and enhanced multi-domain military capabilities. Challenges persist in balancing security needs with constitutional constraints and managing regional relationships.

Conclusions:
Japan's security restoration marks a profound shift, balancing proactive defense with pacifist principles. This evolution impacts regional stability and the U.S.-Japan alliance, positioning Japan as a key player in maintaining peace while raising some neighbors' concerns. Japan's path forward requires a delicate equilibrium between enhancing military capabilities and prioritizing diplomacy and economic cooperation. Success depends on navigating historical legacies, fostering domestic consensus, and adeptly maneuvering through complex international imperatives in an increasingly challenging security environment.