This book is a collection of recommendations from RIDU during the Network of ASEAN Defence and Security Institution (NADI) activities in 2023. It is a forum of ASEAN think tanks and policy research institutions specializing in defence and security issues, academics researching defence and security cooperation, and defence officials discussing security cooperation issues to be further discussed at the ASEAN Summit and ASEAN Defence Ministers' level. The NADI events in 2023 took place in March in Jakarta, June in Bangkok, August in Malacca and October in Hue City.