Opinio Juris

Causation in Climate Change: The International Court of Justice (ICJ)’s Climate Change Advisory Opinion vis-à-vis English Tort Law [Dr. Juan-Pablo Peréz-León-Acevedo is a DPhil in Law candidate and a tutor at the University of Oxford. He also teaches at the Universities of Reading, Southampton, Oslo, and Abo Akademi (Finland)]…

Causation in Climate Change: The International Court of Justice (ICJ)’s Climate Change Advisory Opinion vis-à-vis English Tort Law

opiniojuris.org/2026/03/03/c...

The Ukrainian Genocide Allegations Case Revisited after the Russia’s Counter-claims Admissibility Order [Quazi Omar Foysal is a Bangladeshi-qualified international lawyer, currently pursuing a PhD at La Trobe University, Australia] When the ICJ issued a press release dated 31 January 2025 stating tha…

The Ukrainian Genocide Allegations Case Revisited after the Russia’s Counter-claims Admissibility Order

opiniojuris.org/2026/03/02/t...

From Vulnerability to Rights: The Bonaire Climate Case and Island Communities [Aikaterini [Katerina] Tsampi is Assistant Professor of International Law at the University of Groningen and Rapporteur of the International Law Association (ILA) Study Group on “International Law,…

From Vulnerability to Rights: The Bonaire Climate Case and Island Communities

opiniojuris.org/2026/03/02/f...

(Ir-)Responsible by Design? Corporate Guardrails and the Governance of Military AI [Jessica Dorsey is an Assistant Professor of International Law at Utrecht University School of Law; Elke Schwarz is a Professor of Political Theory at Queen Mary University London; Ingvild Bode is …

(Ir-)Responsible by Design? Corporate Guardrails and the Governance of Military AI

opiniojuris.org/2026/03/02/i...

The Pentagon/Anthropic Clash Over Military AI Guardrails [Jessica Dorsey is an Assistant Professor of International Law at Utrecht University School of Law; Elke Schwarz is a Professor of Political Theory at Queen Mary University London; Ingvild Bode is …

The Pentagon/Anthropic Clash Over Military AI Guardrails

opiniojuris.org/2026/02/26/t...

Terraforming Warfare and International Law [Dr Saeed Bagheri is Lecturer (Assistant Professor) in International Law at the University of Reading School of Law. His research focuses on the law on the use of force and international humanitari…

Terraforming Warfare and International Law

opiniojuris.org/2026/02/25/t...

ICJ’s Recent Order in Ukraine v Russia Genocide Case: Declaratory Relief, Asymmetric Counter-Claims, and Direct Connection Requirement [Anastasiya Donets leads the Ukraine Legal Team at the International Partnership for Human Rights, working on strategic litigation and corporate accountability related to Russia’s full-scale invasi…

ICJ’s Recent Order in Ukraine v Russia Genocide Case: Declaratory Relief, Asymmetric Counter-Claims, and Direct Connection Requirement

opiniojuris.org/2026/02/24/i...

UN Sanctions on Iran: Back in Force or Gone for Good? [Mohammadhossein Sedehi is a DPhil student in international law at the University of Oxford, St Edmund Hall] Introduction Almost 10 years ago, five permanent members of the UN Security Council (UNS…

UN Sanctions on Iran: Back in Force or Gone for Good?

opiniojuris.org/2026/02/24/u...

Efforts to Protect the ICC from Sanctions: Dialogue between States Parties and Non-States Parties [Emre Acar is a PhD Candidate at Leiden University’s Grotius Centre for International Legal Studies of Leiden Law School] In recent years, the International Criminal Court (ICC) has faced a growing…

Efforts to Protect the ICC from Sanctions: Dialogue between States Parties and Non-States Parties

opiniojuris.org/2026/02/23/e...

Aerial Incident of 25 December 2024: Issues of Russian Responsibility [Doniyor Mutalov is a Research Assistant at the Center for International Law and Governance, where he works with Professor Sebastián Mantilla Blanco. He holds an M.A. in Law and Diplomacy from The …

Aerial Incident of 25 December 2024: Issues of Russian Responsibility

opiniojuris.org/2026/02/23/a...

New Background Paper on Hypersonic Weapons and International Law

opiniojuris.org/2026/02/20/n...

Why Aren’t We Talking About Sri Lanka Anymore? “Sri Lanka Solution” Followers Face Justice, but Not Sri Lanka [Anji Manivannan is the Legal Director of People for Equality and Relief in Lanka (PEARL), where her work contributes to its international justice and genocide recognition efforts] In 2015, two UN …

Why Aren’t We Talking About Sri Lanka Anymore? “Sri Lanka Solution” Followers Face Justice, but Not Sri Lanka

opiniojuris.org/2026/02/20/w...

Assessing Syria’s Progress Since Assad [Fadel Abdulghany is executive director of the Syrian Network for Human Rights and author of The Use of Chemical Weapons in Syria and the Failure of the International Community and Undermining the …

Assessing Syria’s Progress Since Assad

opiniojuris.org/2026/02/20/a...

Featured Announcement: BIICL Training Spring 2026 The British Institute of International and Comparative Law (BIICL) has announced its programme of short courses for spring 2026. Led by BIICL experts and external partners, BIICL’s training i…

Featured Announcement: BIICL Training Spring 2026

opiniojuris.org/2026/02/20/f...

Symposium on International Investment Law & Contemporary Crises: Beyond Empire – Global Economic Governance and Investor-State Dispute Settlement in the Banking and Finance Sector [Güneş Ünüvar is a Senior Lecturer (Associate Professor) at the University of Exeter Law School (as of June 2026), and an Associate Fellow at the Academy of International Affairs Nordrhein-Westfale…

Symposium on International Investment Law & Contemporary Crises: Beyond Empire – Global Economic Governance and Investor-State Dispute Settlement in the Banking and Finance Sector

opiniojuris.org/2026/02/19/s...

Symposium on International Investment Law & Contemporary Crises: The Police Powers Doctrine and the Right to Regulate in Banking and Finance Investment Disputes – Drawing the Line in International Inv... [Saïda El Boudouhi is a professor at Université Paris 8. She has held academic positions across leading French and European institutions and contributes actively to contemporary debates on the evol…

Symposium on International Investment Law & Contemporary Crises: The Police Powers Doctrine and the Right to Regulate in Banking and Finance Investment Disputes – Drawing the Line in International Investment Law

opiniojuris.org/2026/02/19/s...

Symposium on International Investment Law & Contemporary Crises: Energy Finance Market Design & IIA Claims [Frederic G. Sourgens is the James McCulloch Chair in Energy Law at Tulane Law School and Director of the Tulane Center for Energy Law, and a practicing arbitration lawyer. He has acted as counsel …

Symposium on International Investment Law & Contemporary Crises: Energy Finance Market Design & IIA Claims

opiniojuris.org/2026/02/18/s...

Symposium on International Investment Law & Contemporary Crises: Divergent Approaches to the Nationality of Corporate Claimants in Banking and Finance Investor-State Arbitration [Francis Xavier, SC, PBM, FCIArb, C.Arb, is Rajah & Tann’s Regional Head of Disputes Group and is recognised as a leading disputes lawyer.  He is a past global President of the Chartered I…

Symposium on International Investment Law & Contemporary Crises: Divergent Approaches to the Nationality of Corporate Claimants in Banking and Finance Investor-State Arbitration

opiniojuris.org/2026/02/18/s...

Symposium on International Investment Law & Contemporary Crises: Central Banks as Players in International Investment Treaty Disputes [Kiran Nasir Gore is an international disputes lawyer and academic whose +15 years of practice span commercial and investor‑State arbitration, public international law, and complex cross‑border lit…

Symposium on International Investment Law & Contemporary Crises: Central Banks as Players in International Investment Treaty Disputes

opiniojuris.org/2026/02/17/s...

Symposium on International Investment Law & Contemporary Crises: Do Investment Treaties Accord Too Much (or Too Little) Protection to Banking and Finance Investments? [Kai-Chieh Chan is co-author of the Empirical Study on International Investment Law Protections in Global Banking and Finance. He holds master degrees from Sciences Po Paris (cum laude) and Paris-P…

Symposium on International Investment Law & Contemporary Crises: Do Investment Treaties Accord Too Much (or Too Little) Protection to Banking and Finance Investments?

opiniojuris.org/2026/02/17/s...

Symposium on International Investment Law & Contemporary Crises: Crises as Investor-State Dispute Catalysts – The Banking and Finance Sector [David Attanasio is a Partner at Womble Bond Dickinson LLP based in Washington, DC, and a co-author of the Empirical Study on International Investment Law Protections in Global Banking and Finance.…

Symposium on International Investment Law & Contemporary Crises: Crises as Investor-State Dispute Catalysts – The Banking and Finance Sector

opiniojuris.org/2026/02/16/s...

Symposium on International Investment Law & Contemporary Crises: What Empirical Trends Suggest about the Future of the Field [Arif Hyder Ali, FCIArb, is co-author of the Empirical Study on International Investment Law Protections in Global Banking and Finance. His career spans senior roles at major international firms, t…

Symposium on International Investment Law & Contemporary Crises: What Empirical Trends Suggest about the Future of the Field

opiniojuris.org/2026/02/16/i...

Seeking Visibility and Accountability in Russia’s War on Ukraine: Efforts Towards Disability‑Inclusive Justice [Ruby Axelson is the Head of Gender and Child Justice at Global Rights Compliance. Tobias Freeman is a senior lawyer working with Global Rights Compliance in Ukraine and member of the IHL Centre&#8…

Seeking Visibility and Accountability in Russia’s War on Ukraine: Efforts Towards Disability‑Inclusive Justice

opiniojuris.org/2026/02/16/s...

The Tainted Matrix: Oil’s Substitution Logic and the Limits of “Clean” Trade [Ariel Costa holds a doctorate in public international law and has worked with universities and research institutions across Europe, Asia, and the Americas. The author lives in the US on a temporar…

The Tainted Matrix: Oil’s Substitution Logic and the Limits of “Clean” Trade

opiniojuris.org/2026/02/13/t...

When War Bets on Protest: Iran’s Civilians in a Double Bind [Mojtaba Touiserkani has a Ph.D. in international relations from the University of Tehran] In early January 2026, Iran went dark. Protests that began as economically driven unrest—sparked by a coll…

When War Bets on Protest: Iran’s Civilians in a Double Bind

opiniojuris.org/2026/02/13/w...

Counting the Cost of Climate Change: Hits, Misses and the Future of Environmental Compensation After the ICJ’s Advisory Opinion [Mohit Khubchandani is an International Disputes Resolution Attorney and PhD candidate at Leiden Law School, writing his PhD on “Forum and harm specific metrics of compensation for environmen…

Counting the Cost of Climate Change: Hits, Misses and the Future of Environmental Compensation After the ICJ’s Advisory Opinion

opiniojuris.org/2026/02/13/c...

Reflections on the Failure of the International Community Regarding Protests in Iran [Parisa Zangeneh recently passed her PhD viva at the Irish Centre for Human Rights, where her work was supported by the Hardiman Scholarship] In recent weeks, the leadership of the Islamic Republic…

Reflections on the Failure of the International Community Regarding Protests in Iran

opiniojuris.org/2026/02/12/r...

Hoarding The Mandate: The Board of Peace and Its Subversion of the UN Security Order [The authors are third year law students at the West Bengal National University of Juridical Sciences (WBNUJS), Kolkata.] The UN Charter rests on a distinctive normative conception of sovereignty. …

Hoarding The Mandate: The Board of Peace and Its Subversion of the UN Security Order

opiniojuris.org/2026/02/12/h...

Reforming Military Obedience: Strengthening Vertical Checks on Trump’s (Ab)use of War Powers [Dr. Ellen Nohle is a senior legal advisor at IHL Centre] Trump’s second term in office has only augmented a set of concerns I raised in a monograph published following his first term (When Militar…

Reforming Military Obedience: Strengthening Vertical Checks on Trump’s (Ab)use of War Powers

opiniojuris.org/2026/02/12/r...

A Quiet Confusion: The ICJ’s Application of Amended Rules to Pending Cases [Brian McGarry is Assistant Professor of Public International Law at Leiden University] The just-concluded hearings in The Gambia v. Myanmar mark the culmination of a long campaign that expanded th…

A Quiet Confusion: The ICJ’s Application of Amended Rules to Pending Cases

opiniojuris.org/2026/02/12/a...