By Dr Erin Pobjie, Lecturer at Essex Law School
Dr Erin Pobjie has just published Prohibited Force: The Meaning of ‘Use of Force’ in International Law (CUP, 2024). Dr Pobjie made use of the University’s dedicated open access (OA) fund to ensure that her book is freely available to students, scholars, and readers everywhere. You can download your copy here.
Dr Pobjie has kindly answered some questions about her work, her choice to go open access and future projects.
Congratulations on the publication of your new book! How does it feel to have it published and freely available?
Thank you! The book is the culmination of a long process, starting with my PhD at the University of Cologne and continuing through my post-doc at the Max Planck Institute in Heidelberg and then as a new lecturer at Essex University. There were many highs and lows over that period and I learnt so much along the way, so it feels emotional and very satisfying to see it finally out.
You chose to make use of the University’s open access fund. Why is open access important to you and how do you think it will benefit your work?
I believe in the principles of open science so it was important to me to publish my book OA. Publishing OA allows me to share my ideas more broadly and without financial barriers, so that my book can hopefully contribute to scholarship, policy and practice on this important topic. Having poured so much into the project, I’m happy that it’s freely available open access thanks to the University’s OA fund.
How did you find the open access process?
It was fairly straight forward once the funding became available. The Open Access team at the University liaised with my editor at Cambridge University Press and were very helpful and responsive in supporting me throughout the process.
What advice about open access, or publishing in general, would you offer to colleagues?
My advice would be to seek feedback early and often, to be proactive throughout the publication process and to advocate for the ideas in your book so that they can contribute to the conversation. These are things I would try to do better next time. It continues to be a learning process now that I’m in the next phase of post-publication, so it’s been very helpful to speak to other colleagues who have recently published books for advice.
Now, about your book, which feels incredibly timely: how did the idea come up and could you explain the key ideas of the book?
The seed for the idea was planted during my LLM at Essex, where I was inspired by the module ‘International Law of Armed Conflict’ taught by Professor Noam Lubell. The first class was about jus ad bellum – the prohibition of the use of force between States. I was captivated by the topic and thought it could be a way to contribute to a cause I feel passionate about (the prevention of war) by exploring and clarifying fundamental legal concepts. Noam introduced me to my future doctoral supervisor, Professor Claus Kreß at the University of Cologne, who encouraged me to focus on the meaning of prohibited force.
The prohibition of the use of force between States is a cornerstone of the modern international legal system and key to international peace and security, but its meaning is unclear. This is especially problematic for uses of force in newer domains like cyber and outer space, or that use emerging technologies. My book therefore seeks to clarify the meaning of prohibited force and proposes a definitional framework that can be applied in practice to identify illegal uses of force. To do this, I analyse the sources of the prohibition (article 2(4) of the UN Charter and customary international law) and their relationship, identify the elements of a prohibited use of force and set out a framework to define a prohibited use of force.
In a nutshell, my argument is that a ‘use of force’ under article 2(4) of the UN Charter describes a type rather than a concept. This means that rather than consisting of a checklist of necessary and sufficient elements (a concept), it consists of a basket of elements which must be weighed and balanced to determine whether the threshold of the definition is met (a type). According to this framework, not all elements must be present for an act to constitute prohibited force if they are compensated by other elements. For example, a hostile or coercive intent may turn a forcible act into a use of force even if other elements are relatively weak, such as a low gravity or if the harm is only potential but unrealised. The final part of my book applies this framework to illustrative case studies, including the use of force in outer space.
What’s next for you? Do you have new projects lined up?
I was recently appointed as co-Rapporteur of the International Law Association’s Committee on the Use of Force, a committee of global experts on the law on the use of force to draft a new report to bring normative clarity to the area of ‘military assistance upon request’ (a.k.a. intervention by invitation). The Committee has a mandate until 2026 to produce the report, so together with my co-Rapporteur Professor James Green I am taking the lead in carrying out the work of the Committee and drafting our report on this topic, with conclusions and commentaries to provide guidance for States.
I’m also excited to have the opportunity to apply the framework I developed in my book to outer space security at the United Nations. I’m currently undertaking a residential fellowship at the United Nations Institute for Disarmament Research in Geneva in their Space Security Programme, where I’m producing a policy report on the use of force in outer space. Humans globally depend on the preservation of safe, secure and sustainable uses of outer space, including for communications, global navigation systems (which underpin banking, financial markets and energy grids), disaster emergency response and humanitarian relief, food production and climate science. These are all placed at risk by military uses of outer space. The policy report will raise awareness of legal restraints on space threats under international law, which must be considered when negotiating and developing new norms for the prevention of an arms race in outer space.
I’m enjoying the mix of doctrinal research and policy engagement and am grateful to have the opportunity to further develop and apply the ideas from my book following its publication.
Prohibited Force: The Meaning of ‘Use of Force’ in International Law is available online and open access through Cambridge University Press. In case you would also like to purchase a hardcopy of the book, you can use the code POBJIE23 on the publisher’s website for a 20% discount until 31 December 2024. DOI: https://doi.org/10.1017/9781009022897.
Do you want to publish your work Open Access? Just complete this brief form and the Open Access team will soon be in touch. More information about making your research available open access can be found on the Open Access Publishing webpage, and you can also get in touch with the OA team via oapublish@essex.ac.uk.