Articles and chapters


  1. ‘The Mutual Assistance Clauses of the North Atlantic and EU Treaties: The Challenge of Hybrid Threats’, (2019) 10 Harvard National Security Journal 405–460
  2. ‘Reversing a Withdrawal Notification under Article 50 TEU: Can a Member State Change its Mind?’, (2017) 42 European Law Review 451–473
  3. with Sean Aughey, ‘Targeting and Detention in Non-International Armed Conflict: Serdar Mohammed and the Limits of Human Rights Convergence’, (2015) 91 International Law Studies 60–118
  4. ‘Untangling Extra-Territorial Jurisdiction from International Responsibility in Jaloud v. Netherlands: Old Problem, New Solutions?’, (2014) 53 Military Law and the Law of War Review 287–318
  5. ‘UN Peacekeeping Operations and Article 7 ARIO: The Missing Link’, (2012) 9 International Organizations Law Review 77–85
  6. ‘The Al-Jedda Case before the House of Lords’, (2009) 13 Journal of International Peacekeeping 181–196
  7. ‘The European Union Status of Forces Agreement (EU SOFA)’, (2008) 13 Journal of Conflict and Security Law 353–391
  8. ‘Status of Forces and Status of Mission Agreements under the ESDP: The EU’s Evolving Practice’, (2008) 19 European Journal of International Law 67–100
  9. ‘The Conclusion of International Agreements in the Context of the ESDP’, (2008) 57 International and Comparative Law Quarterly 53–86
  10. ‘Jurisdiction and International Responsibility in Peace Support Operations: The Behrami and Saramati Cases’, (2008) 8 Human Rights Law Review 151–170
  11. ‘The EU Status of Forces Agreement: Change and Continuity in the Law of Visiting Forces’, (2007) 46 Military Law and the Law of War Review 9–254
  12. ‘The Danish Cartoons Row: Re-Drawing the Limits of the Right to Freedom of Expression?’ (2005) 16 Finnish Yearbook of International Law 365–398


  1. ‘Receiving States, Sending States and the Impact of Their Domestic Laws’, in Robin Geiß and Heike Krieger (eds), The Legal Pluriverse Surrounding Multinational Military Operations (OUP, 2020), 373–392
  2. ‘The Immunities of Visiting Forces’, in Tom Ruys, Nicolas Angelet and Luca Ferro (eds), The Cambridge Handbook of Immunities and International Law (CUP, 2019), 559–576
  3. ‘Hybrid Law, Complex Battlespaces: What’s the Use of a Law of War Manual?’, in Michael A. Newton (ed), The United States Department of Defense Law of War Manual: Commentary & Critique (CUP, 2019), 403–430
  4. ‘Hybrid Warfare, Law and the Fulda Gap’, in Christopher Ford and Winston Williams (eds), Complex Battle Spaces (OUP, 2019), 161–190
  5. with Paul J. Conderman, ‘Jurisdiction’, in Dieter Fleck (ed), The Handbook of the Law of Visiting Forces (2nd, OUP, 2018), 205–260
  6. ‘Al-Jedda V. United Kingdom, App. No. 27021/08, European Court of Human Rights, 7 July 2011’, in Cedric Ryngaert, Ige F Dekker, Ramses A Wessel and Jan Wouters (eds), Judicial Decisions on the Law of International Organizations (OUP, 2016), 351–360
  7. ‘The Status of Armed Forces in Public International Law: Jurisdiction and Immunity’, in Alexander Orakhelashvili (ed), Research Handbook on Jurisdiction and Immunities in International Law (Edward Elgar, 2015), 319–371
  8. ‘The Status of Foreign Armed Forces Deployed in Post-Conflict Environments: A Search for Basic Principles’, in Carsten Stahn, Jennifer S. Easterday and Jens Iverson (eds), Jus Post Bellum (OUP, 2014), 467–501
  9. with Ramses A. Wessel, ‘International Responsibility for EU Military Operations: Finding the EU’s Place in the Global Accountability Regime’, in Bart van Vooren, Steven Blockmans and Jan Wouters (eds), The EU’s Role in Global Governance: The Legal Dimension (OUP, 2013), 126–141
  10. ‘Between Legalization and Organizational Development: Explaining the Evolution of EU Competence in the Field of Foreign Policy’, in Paul James Cardwell (ed), EU External Relations Law and Policy in the Post-Lisbon Era (TMC Asser Press, 2012), 59–95
  11. ‘Autonomy, Attribution and Accountability: Reflections on the Behrami Case’, in Richard Collins and Nigel D. White (eds), International Organisations and the Idea of Autonomy (London, Routledge, 2011), 257–277
  12. ‘Decisions on Operational Action and Union Positions: Back to the Future?’, in Herman-Josef Blanke and Stelio Mangiameli (eds), The European Union after Lisbon: Constitutional Basis, Economic Order and External Action (Springer, 2011), 533–550
  13. ‘The Relationship between Community Law and International Law after Kadi: Did the ECJ Slam the Door on Effective Multilateralism?’, in Matthew Happold (ed), International Law in a Multipolar World (London, Routledge, 2011), 303–322

Contributions to commentaries

  1. Article 28, Article 29 and Article 37, in Herman-Josef Blanke and Stelio Mangiameli (eds), Commentary on the Treaty on European Union (Berlin, Springer, 2013), 981-1016, 1017-1039 and 1131-1145
  2. Article 26, Article 25 and Article 26 TEU, in H. Smit, P. Herzog, C. Campbell and G. Zagel (eds), Smit and Herzog on The Law of the European Union (Release 13, July 2012) (New York, Matthew Bender, LexisNexis, 2012)