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[Daniel Bodansky is Foundation Professor of Law at the Center for Law and Global Affairs’ Faculty Co-Director at the Sandra Day O'Connor College of Law; an Affiliate Faculty Member, Center for Law, Science & Innovation; an Affiliate Faculty Member, Global Institute of Sustainability,School of Sustainability, Arizona State University.] In general, climate change conferences of the parties (COPs) can be divided into big-COPs and mini-COPs. Of course,...

[Carsten Stahn is Professor of International Criminal Law and Global Justice at Leiden University and Programme Director of the Grotius Centre for International Legal Studies. He is Co-Editor-in-Chief of the Leiden Journal of International Law, Executive Editor of the Criminal Law Forum and project leader of the Jus Post Bellum Project.] Introduction International Criminal Justice is a tipping point. It is a bit like a scene in Woody Allen’s “Match Point” movie. The ball is in the air. It has hit the net. But it cannot quite decide where to go. It may tip to the one corner of the field, or the other. There has been a lot of support for international criminal justice in past decades. The EU has been crucial in this regard. But there is also backlash and critique. Some wonder what’s the point of international courts and tribunals. The international community is good at creating new treaties and new institutions. But it seems to  be less good at devoting long-term attention and resources that are necessary to ensure that they are effective. Once a new institution is created, there is a feeling the job is done and that is time to move on. After the ICC withdrawals, the question of the justification of international criminal justice is more acute than ever. Some might claim that the withdrawals are a sign that international criminal justice becomes more effective since it targets power politics. Other might say that we need to go back to the drawing board and reflect more critically on the foundations of our assumptions. Both arguments appear to have a grain of truth. One crucial question is the role of regional organizations in international criminal justice. After the end of the Cold War, institutional development has quickly shifted from domestic to universal approaches. The role of regional institutions has long remained at the periphery.     Recently, much attention has been devoted to regionalization in the context of African critiques of international criminal justice, and the Malabo Protocol. While the Protocol has many problems (e.g., in relation to crime base, complementarity or immunities), there seems to be at least some support for the general assumption that regionalism can have benefits for international criminal justice enforcement.  Such advantages include geographical proximity to crimes, and the ability to reflect specific regional interests or priorities. In existing doctrine, some attention has been devoted to the role of regional human rights courts as “quasi-criminal jurisdictions”. But there are relatively few explorations of the role of the EU as actor in international criminal justice. The EU counts undoubtedly among the strong champions of international criminal justice on the international plane. One of its unique strengths is that it has achieved some “unity in diversity”. All 28 EU member states are states to the ICC Statute. This allows EU members to act as a collective entity. EU support for the project of international criminal justice cuts across institutions. The Council has enacted multiple legal instruments to strengthen national investigation and prosecution of mass atrocity crimes. Initiatives, such as the European Arrest Warrant, the European Evidence Warrant, the Framework Decision on the freezing of property and evidence, and the Framework Decision on the standing of victims in Criminal Proceedings, or the European Network of Contact Points are relatively unique on the international plane. The EU was the first regional organization to sign an agreement on cooperation and assistance with the ICC in 2006. The European Parliament has been a strong supporter of international justice. Europeans have taken a lion’s share in the funding of international criminal justice. This is complemented by the important work of Eurojust, and of course, the broader network of the Council of Europe which extends beyond EU Member States. The main achievements from a macro perspective are in my view two-fold. First, European institutions have forged a certain alignment of normative preferences within the European legal space. This is an important achievement. Hardly any other regional bloc has gained a similar level of convergence, and approximation of national approaches.  Decisions under the Justice and Home Affairs Pillar have prompted various member States, like Belgium, Denmark, Germany, The Netherlands and Sweden to establish “specialized units” for the investigation and prosecution of international crimes.  EU member states score high in terms of implanting legislation. This suggests a positive correlation between EU membership and commitment to international criminal justice. The European Area of Freedom, Security and Justice remains imperfect. The EU can do better in terms of strategic coordination.  Some domestic jurisdictions feel that developments are so dynamic that it is difficult to keep up with the pace of transformation. But the degree of cooperation defies comparison. Second, EU approaches have significantly contributed to “damage control” at the international level. Without the support of European countries, the ICC might have never seen the day in its current form. In the early years of the Court, the EU has taken a strong counter approach towards US policies towards international criminal justice. US approaches have navigated between objection under the Bush Administration to “smart power” approaches under Obama administration. The EU has differed fundamentally. It has openly discarded US objections in a common position in 2003, while trying to foster a constructive partnership between the US and the ICC. The EU has defined guiding principles for bilateral non-surrender agreements under Art. 98 of the ICC Statute. Later, the EU members have been instrumental in securing Security referrals to the ICC in relation to Darfur and Libya, and supporting a Syria referral. The EU approach may be characterized by three cardinal features: (i) “principled” pragmatism,  (ii) non-confrontational approaches, and (iii) a long-term vision towards international justice. These are virtues that are key to the success of international criminal justice. In times like these, the EU serves more than ever as a fire brigade. Damage control is urgently needed. The voices of European members on the Security Council are crucial to avoid action that might hamper existing institutions. There is a need to speak up against unfair critique, and to counter false rhetoric.

[Charles Kels is a major in the U.S. Air Force. His views do not reflect those of the Air Force or Department of Defense.] The fascinating and edifying debate between Adil Haque (see here, here, here, and here) and, respectively, Deborah Pearlstein (see here), Jonathan Horowitz (see here and here), and Kevin Heller (see here and here) over the criteria for...

[Geoffrey S. Corn is Professor of Law at South Texas College of Law Houston in Houston Texas. Prior to joining the South Texas College of Law Houston faculty in 2005, Professor Corn served in the U.S. Army for 21 years as an officer, retiring in the rank of Lieutenant Colonel. He served a subsequent year as the Army’s senior civilian...

[Adil Ahmad Haque (@AdHaque110) is a Professor of Law and Judge Jon O. Newman Scholar at Rutgers Law School.  His first book, Law and Morality at War, will be published by Oxford University Press in January.] My sincere thanks to Kevin Heller for thoughtfully engaging with my view that the law of non-international armed conflict (NIAC) applies to first strikes between State armed...

I have been following with great interest the debate at Just Security between Adil Haque and Jonathan Horowitz over whether the existence of a non-international conflict (NIAC) exists the moment a state launches a "first strike" at an organized armed group or whether hostilities of a certain intensity between the two are required. Adil takes the former position (see here, here, and here);...

[Oliver Windridge is a British lawyer specializing in international human rights and international criminal law. Oliver is founder of The ACtHPR Monitor, an independent blog and website dedicated to the African Court on Human and Peoples’ Rights, on twitter @acthpr_monitor. In June 2014 he was one of five non-African lawyers to be appointed to the Court’s inaugural list of Legal...

As we all continue to digest the stunning election results from last week, I continue to focus on ways in which a President Trump could use his substantial powers over foreign affairs in unique and unprecedented ways.  Withdrawing from trade agreements could be a major theme of his administration.  Somewhat less noticed is the possibility that a President Trump fulfills...

[Odile Ammann is a PhD candidate at the University of Fribourg, Switzerland and a visiting researcher at the University of Oxford. Benedikt Pirker is a Senior Lecturer (Maître d’enseignement et de recherche) at the University of Fribourg, Switzerland, where he teaches and does research in international law and EU law.] In his Opinio Juris blogpost of November 3, Julian Ku contends that...

Law professors should not be political prognosticators.  That’s probably something on which we can all agree.  Nonetheless, here’s my prediction: despite the current buzz (see also, this), California will not secede from the United States. Sorry, Silicon Valley Hamiltons.  However, the “Yes California” movement, spurred on by a Trump presidential victory can be instructive on the law,  psychology, and incentives behind more robust secessionist movements around the world. As Julian mentioned in a post earlier today, the "#Calexit"  movement is seeking a referendum on secession in 2019.  The  group’s website states:
"As the sixth largest economy in the world, California is more economically powerful than France and has a population larger than Poland. Point by point, California compares and competes with countries, not just the 49 other states.” In our view, the United States of America represents so many things that conflict with Californian values, and our continued statehood means California will continue subsidizing the other states to our own detriment, and to the detriment of our children. Although charity is part of our culture, when you consider that California’s infrastructure is falling apart, our public schools are ranked among the worst in the entire country, we have the highest number of homeless persons living without shelter and other basic necessities, poverty rates remain high, income inequality continues to expand, and we must often borrow money from the future to provide services for today, now is not the time for charity.
This statement, and much about the movement, is like a study in secessionist politics, albeit with a sun-kissed white wine and Jacuzzis twist.  OK, that Jacuzzi quip may be snarky, but I wanted to attach an image to this idea: the yearning for Calexit, such as it is, is an example of a wish for a “secession of the successful” (to use a term political geographers John O’Loughlin, Gerard Toal, and Rebecca Chamberlain-Creanga used to describe the attempted  Transnistrian secession from Moldova, actually). These types of separatist movements, in which the separating group wants to stop paying rents to the central government and/or keep resources within their own territory for themselves, are generally called “tax exits.” The Transnistrian, Slovenian, and Croatian separations or or attempted secessions all had elements of tax exits. (See P. Collier & A. Hoeffler, ‘The Political Economy of Secession’, in H. Hannum & E. F. Babbitt (eds), Negotiating Self Determination (2006), 46 (concerning Slovenia and Croatia)). This is not even a solely a phenomenon of nation-building.  In the U.S., we have even had new towns made up of wealthy neighborhoods that separated themselves from existing municipalities over tax allocations. Perhaps the best analogy, though, is Catalonia.  Relatively wealthy,  a large export economy, and the hub of creative industries in Spain, Catalonia even looks like parts of California (or vice versa). A common complaint is that wealth generated in Catalonia is redistributed by the national government to regions that are economically weak. Now, here’s what the Calexiters argue:
Since 1987, California has been subsidizing the other states at a loss of tens and sometimes hundreds of billions of dollars in a single fiscal year. As a result, we are often forced to raise taxes and charge fees in California, and borrow money from the future to make up the difference. This is partly why California presently has some of the highest taxes in the country, and so much debt. Independence means that all of our taxes will be kept in California based on the priorities we set, and we will be able to do so while repaying our debts and phasing out the current state income tax.
You can’t state more clearly that a tax exit is a significant motivating factor for Calexit. So, if a majority of Californians say “yes to California,” do they have a right to become their own country under domestic law or international law? Julian answered the domestic law question in his post. As for international law, the right to self-determination is described in Article 1 of both the International Covenant of Civil and Political Rights Covenant and the International Covenant on Economic, Social and Cultural Rights:
All peoples have the right of self-determination. By virtue of that right they freely determine their political status and freely pursue their economic, social and cultural development.
However, while Catalans, for example, can make a credible argument that they are a distinct people with their own language and culture and a heritage as a significant nation in European history, Calexiters are mainly upset about the recent election and would like to hang on to more tax revenues.  Those are disputes over policy, but not claims of an independent national identity. Regardless, since the birth of the United Nations, diplomats and jurists emphasized that a right of self-determination does not provide a remedy of secession outside of the context of decolonization. A broad right to secession would have clashed with a cornerstone of the UN, the territorial integrity of states. Outside of the context of decolonization, the right of self-determination for communities that are within already existing states is understood as a right to “internal” self-determination: the pursuit of political, cultural, linguistic, and other rights within the existing state (in this case, the U.S.). However, secession is not in and of itself illegal under international law (although it may be linked to an act that is breach in international law, such as a military intervention by another state: think Russia invading Georgia to assist South Ossetia.) While secession may be neither a right nor illegal under international law, secessionist acts are usually illegal under domestic laws.  Taken together, whether or not a secession is successful begins as a domestic political struggle, framed by the legal system of the pre-existing country and sometimes implicating international law due to intervention by other countries (or if the secession becomes a non-international armed conflict, but that's another story). All this sounds quite exotic in the context of some tech industry founders applying their credo of “disruption” to national politics. (I’m just waiting for the first Calexiter to say he or she aims to “break shit.”)  The short answer is that there is no right for California to secede under either domestic or international law. However, the rhetoric of self-determination is enticing to would-be nation-builders and Calexiters make many of the same mistakes as other tax exit secessionists: First, they assume there is a clear path to secession, when that is rarely the case.  Talk to the Catalans about this.  They have mustered hundreds of thousands of people in the streets in