Which forms of security expertise are crucial for a country like Denmark in times of geopolitical turmoil? The article answers this question in three steps. First, it discusses the international Return of geopolitics. Second, it presents a typology of security policy expertise categorized according to different questions at their core, including military expertise, social science expertise, peace and conflict studies, languages and area studies. Third, it discusses Danish foreign and security policy in this context, including avoiding a relapse into strong bipolarity. How does a small, open economy like Denmark, with a strong dependence upon international alliances and multilateralism best maintain or recalibrate cooperation and rethink its investments in expertise for this new phase of global politics? The article argues for rethinking the ecosystem of security expertise and policy, including increasing investments in language and area studies, peace and conflict studies as well as investing in cross-disciplinary and practice oriented security expertise.