Indonesia-Malaysia Defense Cooperation to Face the Threats of Strategic Environmental Development

: This study tries to explain the defense cooperation between Indonesia and Malaysia in an effort to face the threat of the development of the strategic environment. The development of a strategic environment at the global, regional, and national levels that is increasingly complex and dynamic requires that each country cooperate with one another. Indonesia has established a cooperative relationship with Malaysia since 1957, but currently the literature discussing the cooperation between the two is still limited. Therefore, this research is aimed at defense science treasures in the field of international cooperation. The method used is a library study to analyze how defense cooperation, forms of cooperation and barriers to Indonesia-Malaysia cooperation are used. With the results of research on defense cooperation between Indonesia and Malaysia, it is very important to strengthen the defense of the two countries, in the form of cooperation in the form of handling and narcotics, increasing maritime security, defense equipment and the professionalism of the TNI. While the obstacles that occur are the tides of international cooperation caused by conflicts over territorial disputes as well as differences in the legal system and workers