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Opinio Juris is pleased to welcome Professor Neomi Rao of George Mason University School of Law as guest-blogger for the next week. With the Syria crisis re-emerging as a possible flashpoint for military intervention, we thought it would be interesting for Professor Rao to discuss her recent work on the status and impact of the "Responsibility to Protect" principle that is...

There has been a rightful flurry of media interest in the saga of Edward Snowden, the U.S. government contractor who is the apparent source of the leaks about the U.S. National Security Program's data mining surveillance program.  One area of focus is Snowden's decision to take refuge in Hong Kong from a possible prosecution by the U.S. government. As I noted...

A couple of months ago, the ICTY Appeals Chamber acquitted Momčilo Perišić, the Chief of the General Staff of the Yugoslav Army, of aiding and abetting various international crimes committed by the Army of Republika Srpska (VRS) during the war in the Balkans. According to the Appeals Chamber, when a defendant is accused of aiding and abetting crimes committed by an organization,...

By any standard, the Pre-Trial Chamber's rejection of Libya's admissibility challenge is a crushing defeat for the Libyan government. Libya's challenge failed for two basic reasons: (1) Libya is not investigating the same case as the OTP; and (2) Libya is currently unable to genuinely prosecute Saif. I will address the first ground, which I think is legally correct but...

Irini Papanicolopulu highlights the important and sometimes central role that non-state actors have in the whaling disputes between Japan and Australia.  Invoking the traditional lens of international law, she considers whether the actions of Sea Shepherd Conservation Society (SSCS) or the Institute for Cetacean Research can implicate state responsibility. Her conclusion is properly uncertain given the murky relationships between Australia...

This week we are delighted to bring you a symposium exploring the intersection between the law of responsibility and the law of the sea.   The motivation for this symposium is twofold: First, although there is long interaction between the law of the sea and the law of responsibility, the law of the sea has become an area where the intersection is of...

In previous posts (here and here), I discussed the reasons why Obama will never actually enforce the "near certainty" standard regarding civilian casualties and noted that the standard is vastly more restrictive than IHL's principle of proportionality. In this post, I want to explain why the new targeting standards for the use of lethal force "outside the United States and...

For the procrastinators among us, here's another friendly reminder about our New Voices Symposium coming up in July and August. As a recap, this July, we are planning to launch a new feature called New Voices: a two-month online symposium to run alongside our regular posts. Our goal is to give students, new practitioners and emerging scholars a chance to profile...