The purpose of this paper is to (1) describe internal factors that influence Indonesian national defense policy towards the security dynamics of Asia Pacific Region, (2) examine the extent of influence of those internal factors and Indonesian defense policy on the security dynamic of Asia Pacific Region, (3) evaluates the degree of relationship among those internal factors that influence Indonesian defense policy on the change of security dynamics in Asia Pacific Region. This study was carried out in Bandung and Jakarta from February 2019 to February 2020. The data are collected through an interview by a questionnaire. This ex post facto research referred to a factual condition in the field. The unit of analysis in this study are employees at the Ministry of Foreign Affairs and the Ministry of Defense of the Republic of Indonesia, amounting to 97 respondents. The data are analyzed using the Structural Equation Model (SEM) program. Our research points out a direct influence of the Asia Pacific power map, state’s security dynamics, government’s attitude, and defense policy toward the security dynamics of the Asia Pacific Region with the determinant coefficient (R₂) by 0.74, and the rest 26% are influenced by uninvestigated factors. This study concludes that the security dynamics of the Asia Pacific region influence the security policy of the Asia Pacific Region with the determinant coefficient (R₂) of 0.69; the rest 31% are due to the influence of variables outside this present study.

Keywords: Security Dynamics of the Asia Pacific Region, State’s security dynamics, defense policy, Asia Pacific power map, government attitude.