In recent years, outer space has been expected to play an important role as a civilian system in navigations, communications, broadcasting, etc., as a frontier of science and technology, and as a fundamental driving force for economic growth, in line with the progress of science and technology. On the other hand, as military use of outer space has become more active worldwide lately, outer space has become a war zone and is turning into a "contested, competitive, and crowded" space. This session will share the challenges of multilateral defense cooperation in outer space among the major related countries and discuss how to ensure the security of outer space through international cooperation.

Contents of Discussion:

• Introduction: Current Situation (by the moderator)
• Space Security Measures taken by Japan, the U.S., Australia, and the U.K. (announced by each country)
• International cooperation on military aspects in outer space (free discussion)
• Summary(by the moderator)