The East Africa Community (EAC) comprises various instabilities, including violence, humanitarian crises, environmental issues, and conflicts, both within and between states. In response, these countries have established defense diplomacy, which involves the non-violent utilization of military resources to pursue peace and stability in the area. Their goal is to create a unified force to address common threats that endanger peace and stability within the region. Defense diplomacy encompasses a strategic engagement, Confidence Building Measures (CBMs), Capacity Building, and the cultivation of international reputation. The fundamental question arises: How can the EAC engage in security cooperation amid the multitude of issues faced within the region? Our article aims to comprehend the implementation of CBMs among member states, focusing on enhancing interoperability within a case study of regional security cooperation aimed at implementing peace and stability in the Democratic Republic of Congo (DRC). Our research employs qualitative analysis using the concept of Confidence and Security Building Measures (CSBM) and applies DIME theory to illustrate the process of establishing and strengthening trust among member states in the region. The primary outcome of this study underscores the critical role played by diplomacy and military strategies in resolving peace and security issues in the DRC