Lionel Leonard Cohen – The Rt Hon Lord Cohen of Walmer in the County of Kent – was a distinguished British lawyer. In 1951, he was appointed a Lord of Appeal in Ordinary. Given the fact that he was a committed Jew, this was a remarkable achievement in its time. He chaired the Committee which produced the 1945 Cohen Report, whose recommendations were adopted and in due course enacted in the Companies Act 1948.

The principle of proportionality, notoriously obscure in application and subjective in interpretation, has been enforced so rarely as to call into question its potency as a meaningful international legal standard. Nonetheless, international criminal tribunals, academics, and the ICRC's monumental study on customary international humanitarian law all confidently proclaim the principle as embedded in the customary international law applicable to both international and non-international armed conflicts. To assess whether these claims are accurate, and to flesh out how states interpret the principle in practice, the author and a colleague have undertaken a long-term, multinational empirical study of state practice in interpreting and enforcing the proportionality principle. This article discusses the methodological options available and explains the one chosen for the proportionality study. The limitations of the study, in spite of its deliberate methodology, suggest that the debilities of the proportionality principle may not be conceptual as much as a byproduct of unnecessary military secrecy. This article concludes that greater transparency in state compliance with the rule of discrimination and the principle of proportionality would, at least, facilitate an understanding of how the hitherto obscure principle operates in practice and, at best, could create systemic effects that would decrease the dangers to civilians in armed conflicts.

The reactions to the reports of Osama bin Laden's death were many: shock, relief, joy, wariness, elation, reservation. Not surprisingly, an intense debate soon emerged over the legality of killing Osama bin Laden. Critics – including the authors of the article, ‘Has “Justice Been Done”? The Legality of Bin Laden's Killing under International Law’, Kai Ambos and Josef Alkatout – raise many interesting and thought-provoking questions. The purpose of this submission is to respond to the arguments of Ambos and Alkatout. This response article argues that the killing of Osama bin Laden was lawful under international humanitarian law. More specifically, a careful legal analysis demonstrates that a non-international armed conflict exists between the United States and Al Qaeda. The evidence overwhelmingly establishes that Al Qaeda is an organised armed group under international humanitarian law. Osama bin Laden most accurately could be thought of as a strategic level commander of Al Qaeda. He has been actively involved in planning and co-ordinating armed attacks against military and civilian targets for years, including the most recent planning of attacks commemorating the tenth anniversary of September 11. As such, he is clearly targetable under international law. Finally, the United States was well within its rights under international law to launch an attack into Pakistan against bin Laden.

There is a tendency among the judiciary to apply the standard of ‘effective control’ as the applicable yardstick for apportioning responsibility for wrongful acts between the United Nations and the member states contributing troops to UN peace-support operations. This is evidenced by recent decisions in the cases of Srebrenica (Dutch Court of Appeal, 2011), Al Jedda (European Court of Human Rights, 2011) and Mukeshimana (Belgian First Instance Court, 2010), which appear to repudiate the ‘ultimate authority and control’ standard espoused by the European Court of Human Rights in Behrami (2007). This process may have been set in motion by (the current) Article 7 of the ILC's Draft Articles on the Responsibility of International Organizations, which may in due course reflect customary international law. From a policy perspective, the application of an ‘effective control’ standard is highly desirable, as it locates responsibility with the actor who is in a position to prevent the violation.