The Treaty of Mutual Cooperation and Security is a bilateral agreement between the United States and Japan, signed in 1960. It aims to ensure mutual defense and security cooperation, allowing the U.S. to maintain military bases in Japan while committing to defend Japan in case of an armed attack. This treaty has played a crucial role in shaping the security landscape in the Asia-Pacific region. It facilitates joint military exercises and strategic dialogues, enhancing both nations' ability to respond to regional threats and promoting stability in the area.