Global-regional partnerships between the United Nations (UN) and so-called regional organisations like the European Union (EU) and the African Union (AU) are the new reality of the global peace and security regime. At first glance, these global-regional arrangements seem to be the perfect match to shape world domestic policy and to strengthen the international efforts in peace and security, especially in peacekeeping. But shedding light onto UN-EU- and UN-AU-relations raises questions about the capabilities of global-regional partnerships to support the project of world domestic policy, especially questions that comprise normative and institutional aspects.