2022: Makt og avmakt i FNs sikkerhetsråd: Valgte medlemslands veier til innflytelse. NUPI Policy Brief No. 18. Co-authored with Niels Nagelhus Schia.
2022: ‘Global Britain’ and security in the near abroad. Leadership through flexilateralism? NUPI Research Paper No. 3. Co-authored with Øyvind Svendsen.
2022: På hvilke områder har Norge best forutsetninger for å bidra til å styrke det nordiske forsvarssamarbeidet? Report to the Norwegian Defence Commission (commissioned), June.
2022: Differentiated Integration and EU Outsiders: A Norwegian View. EUIDEA Policy Paper. February 2022. Co-authored with Nina Græger.
2022: Security debates and partnership choices in the Nordic states: From differentiation to alignment. NUPI Report No 1/22. Oslo: Norwegian Institute of International Affairs. Co-authored with Øyvind Svendsen, Katja Creutz, Mikkel Runge Olesen, Anna Lundborg Regnér & Jakob Linnet Schmidt.
2021: Nordic partnership choices in a fierier security environment: Towards more alignment. NUPI Policy Brief No. 9. Oslo: Norwegian Institute of International Affairs. Co-authored with Øyvind Svendsen, Katja Creutz, Mikkel Runge Olesen, Anna Lundborg Regnér & Jakob Linnet Schmidt.
2021: Nordic cooperation amid pandemic travel restrictions. FIIA report No. 68, Helsinki: Finnish Institute of International Affairs. Co-authored with Katja Creutz, Sofie Berglund, Telli Betül Kalacan, Alberto Giacometti, Ninna Nyberg Sørensen, Mari Wøien Meijer & Axa Lares.
2021: Small States, Different Approaches. Estonia and Norway on the UN Security Council. Report. Tallinn: Estonian Foreign Policy Institute. Co-authored with Piret Kuusik, Kristi Raik & Niels Nagelhus Schia.
2020: Common fears, common opportunities? Czechia and Norway in the changing international context. Policy Report. Prague: Institute of International Relations. Co-authored with Benjamin Tallis, Morten S. Andersen, Mark Galeotti, Jakub Godzimirski, Jan Mazac, Øyvind Svendsen & Elena Zhirukina.
2019: Ten years on: Reassessing the Stoltenberg Report on Nordic cooperation. Policy Report. Reykjavik: University of Iceland. Co-edited with Ulf Sverdrup. Co-authored with Björn Fägersten, Karsten Friis, Lars Gjesvik, Pia Hansson, Calle Håkansson, Tuomas Iso-Markku, Hans Mouritzen, Silja Bàra Omarsdottir, Au∂ur Birnà Stéfansdottir & Øyvind Svendsen.
2018: Nordic responses to Brexit: Making the best of a difficult situation. NUPI Policy Brief. Co-authored with Björn Fägersten, Pétur Gunnarsson, Juha Jokela, Catharina Sørensen, Baldur Thorhallsson & Anders Wivel.
2017: Strategic cooperation against terrorism 2.0? Collaborating with adversaries. NUPI Policy Brief. Co-authored with Julie Wilhelmsen.
2014: Britain Outside Europe? The Norwegian View. In Möller, Almut & Tim Oliver (eds.). The United Kingdom and the European Union: What would a “Brexit” mean for the EU and other States around the World? DGAP Analyse No. 16. Berlin: Deutsche Gesellschaft für Auswärtige Politik.
2010: Towards a NATO à la Carte? Assessing the alliance’s adaptation to new tasks and changing relationships. NUPI Report. Co-authored with Jakub Godzimirski & Nina Græger.
2009: The Revival of Atlanticism in NATO? Changing Security Identities in Britain, Norway and Denmark. NUPI Report. Co-authored with Nina Græger.
2008: Internasjonale organisasjoner som kontekst. In Neumann, Iver B. (ed.) Norge og alliansene – gamle tradisjoner, nytt spillerom. Oslo: NUPI.
2007: Civil-Military Cooperation in multinational and interagency operations. NUPI Report. Co-authored with Benjamin de Carvalho.