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[Alexander Heinze is an Assistant Professor at the Department of Foreign and International Criminal Law, Institute for Criminal Law and Justice, Georg-August-Universität Göttingen. He is the author of the book “International Criminal Procedure and Disclosure” (Duncker & Humblot, 2014).] In less than a month’s time, the International Criminal Court (ICC) will celebrate its 20th anniversary. Distinguished speakers will be calling into mind that the ICC was first...

[Melanie O’Brien is Senior Lecturer in International Law at the UWA Law School, University of Western Australia; and an affiliated researcher of the Asia-Pacific Centre for the Responsibility to Protect, University of Queensland.] Followers of Opinio Juris well know Kevin Jon Heller’s criticism of Crossing Lines and its portrayal of the ICC. I recently watched the action-comedy The Hitman’s Bodyguard, a...

The International Law Commission, a group of 34 independent experts, charged with codifying and progressively developing international law is currently (and exceptionally) meeting at the UN in New York. Amidst the substantive conversations on subsequent practice of treaties, customary international law, and jus cogens, there are two other themes that are coming up with some frequency. First, the lack of gender diversity...

[Katayoun Hosseinnejad is a university lecturer of international law and attorney at law in Iran and Pouria Askary is an assistant professor of international law at law school of ATU and a visiting professor of law at Islamic Azad University and Tarbiat Modarres University.] On May 10, two days after the US President pulled his country out of the Joint Comprehensive Plan of...

We have published a series of fascinating posts in recent days debating whether the permanent members of the Security Council have a legal obligation under the UN Charter not to veto resolutions calling for the investigation or prosecution of atrocity crimes. Jennifer Trahan argued yes; Mohamed Helal responded no; and Trahan replied yes again. I am not convinced by Trahan's response...

[Jennifer Trahan is an Associate Clinical Professor at the NYU Center for Global Affairs.] In his Opinio Juris post on May 4, Dr. Mohamed Helal provides a defense of Russia’s veto use related to the situation in Syria, one that he defends as in line with the negotiations of the UN Charter and a vision of veto power of the permanent members of...

On Thursday, May 10, the US Supreme Court will decide whether to grant cert in Budha Ismail Jam v.  International Financial Corporation(IFC), a case involving environmental damage arising from a coal fired power plant in India.    Two excellent blogs on the case written by Rishi Gulati in 2017 can be found here. The case turns on the interpretation of a US...

[David Hughes and Yahli Shereshevsky are Grotius Research Scholars at Michigan Law School.] Western forces have again attacked Syria following the suspected use of chemical weapons by the al-Assad regime. As in 2013 and 2017, international lawyers largely agree that the recent US, French, and British-led operation is illegal. Yet the recent strikes against chemical weapons facilities in Damascus and Homs are...

[Dr. Mohamed Helal is an Assistant Professor of Law at the Moritz College of Law & Affiliated Faculty at the Mershon Center for International Security Studies, The Ohio State University.] On April 10, 2018, Russia vetoed a UN Security Council resolution drafted by the United States that would have created a mechanism to investigate the use of chemical weapons against civilians...

I had the pleasure of participating yesterday in a superb -- and long! -- panel on the 2013 siege of Eastern Ghouta. The panel discussed the facts, the law, and the politics of the siege. I was joined by Hussam Alkatlaby, the Executive Director of the Syrian Violations Documentation Centre; Joost Hiltermann, programme director for Middle East & North Africa at...