: The Common Security and Defence Policy (CSDP) missions are deployed in complex operational environments, where a plethora of national, regional and international actors are present. These present circumstances enable the existence of an - either direct or indirect - but inexorable engagement between all stakeholders involved in similar activities. While the vast majority of current debates and research focus solely on the cooperative dimension of the CSDP in the framework of multilateralism and regionalism, the topic of the EU's engagement with local stakeholders is scarcely explored. Therefore, drawing on the multistakeholder initiative approach (MSI) in economic theory, this paper assesses the engagement of CSDP missions with civil societies and private sector entities in theatres of operations. Employing a single case study approach of inquiry, consisting of the EUCAP Somalia mission this paper aims at answering the research questions: how does EUCAP Somalia engage with local non-state actors, what are the opportunities associated with this engagement and to what extent can a MSI approach be implemented by EUCAP Somalia?By deploying a qualitative research design, this paper uses document analysis within a single case study approach of inquiry. The results of this approach show two distinct tendencies. While EUCAP Somalia informally engages with local non-state actors, this engagement is rather insufficient. Results of this research further show that CSDP missions represent an important tool of EU diplomacy and their engagement with local non-state actors positively impacts the implementation of two of their core principles: local ownership and human security.