International Humanitarian Law Commons^™

The Plea Of Necessity: An Oft Overlooked Response Option To Hostile Cyber Operations, Louise Arimatsu, Michael N. Schmitt

International Law Studies

States are increasingly focused on the measures—cyber or otherwise—that they can take in response to hostile cyber operations. Although cyber operations are usually responded to with acts of “retorsion” (acts that are lawful, although unfriendly), international law recognizes other self-help mechanisms that allow for more robust responses. In the cyber context, most attention has focused on countermeasures and self-defense. Yet, both are subject to various limitations that constrain their availability.

This article examines a further option, the so-called “plea of necessity.” It allows States to respond to a hostile cyber operation when the action taken would otherwise be unlawful but …

Application Of The Due Diligence Principle To Cyber Operations, Tomohiro Mikanagi

International Law Studies

The discreet use of proxies by States renders it difficult to prove attribution to States under the existing rules of attribution. On the other hand, the due diligence principle, if applicable, does not require attribution but can lead to the invocation of State responsibility for cyber operations emanating from the territory of other States. In the Corfu Channel judgment the ICJ recognized “every State’s obligation not to allow knowingly its territory to be used for acts contrary to the rights of other States,” and UN Member States agreed that existing international law applies to cyber operations. However, the UN Members …

Military Action To Recover Occupied Land: Lawful Self-Defense Or Prohibited Use Of Force? The 2020 Nagorno-Karabakh Conflict Revisited, Tom Ruys, Felipe Rodriguez Silvestre

International Law Studies

In September 2020, heavy fighting erupted between Armenia and Azerbaijan in and around Nagorno-Karabakh, a region of Azerbaijan long controlled by Armenia. After two months of military confrontations, a tripartite ceasefire was concluded, drastically altering the pre-existing territorial status quo.

The "Second Nagorno-Karabakh War" brings to light a fundamental question for international law on the use of force—and one that has received limited attention in legal doctrine. The question is this: when part of a State’s territory is occupied by another State for an extended period of time, can the former still invoke the right of self-defense to justify …

Command Accountability For Ai Weapon Systems In The Law Of Armed Conflict, James Kraska

International Law Studies

The use of artificial intelligence (AI) in weapon systems enhances the ability of operational forces to fuse multispectral sensors to understand the warfighting environment, positively identify, track, and select targets, and engage them with the most appropriate effects. The potential for AI to help close the “kill chain” has raised concern that this creates a gap in accountability between the decisions of humans and the acts of machines, with humans no longer accountable for decisions made during armed conflict. This study suggests that there is no gap because the military commander is always directly and individually accountable for the employment …

Armed Conflicts In Outer Space: Which Law Applies?, Frans G. Von Der Dunk

International Law Studies

So far, outer space has merely become involved in terrestrial armed conflicts as part of the supportive infrastructure for military activities. Unfortunately, the risk that this changes is considerably growing, and it can no longer be excluded that (armed) force will become used in outer space, either directed towards Earth or within outer space itself.

This raises serious issues in the legal context, where space law so far has been premised on the hope that armed conflicts in outer space could be avoided whereas the law of armed conflict was not required so far to deal with the use of …

Responding To Hostile Cyber Operations: The “In-Kind” Option, Michael N. Schmitt, Durward E. Johnson

International Law Studies

Facing hostile cyber operations, States are crafting responsive strategies, tactics and rules of engagement. One of the major challenges in doing so is that key aspects of the international law governing cyber responses are vague, unsettled or complex. Not surprisingly, therefore, international law is markedly absent from strategies and operational concepts. Rather, they tend to take on a practical “tit-for-tat” feel as policymakers logically view “in-kind” responses as “fair play.” For them, responding in-kind surely must be lawful notwithstanding any challenges in discerning the precise legal character of the initial hostile cyber operation.

Testing that sense, this article examines the …

The Human Dimension Of Peace And Aggression, Chiara Redaelli

International Law Studies

Since the adoption of the Charter of the United Nations, the current international legal framework has drastically changed. In its traditional understanding, aggression is “the supreme international crime” aimed at protecting sovereignty and the territorial integrity of states. On the other hand, the U.N. Charter endorses an understanding of peace in the negative sense, that is, as mere absence of war. As human rights have gained momentum, they have helped reshape the legal landscape, a phenomenon referred to as the humanization of international law. How do peace and aggression fit within the humanized legal framework? This article will investigate the …

Will Cyber Autonomy Undercut Democratic Accountability?, Ashley Deeks

International Law Studies

In recent years, legislative bodies such as the U.S. Congress and the U.K. Parliament have struggled to maintain a role for themselves in government decisions to conduct military operations against foreign adversaries. Some of these challenges arise from constitutional structures, but they are also due to the changing nature of conflict: a shift away from large-scale kinetic operations and toward smaller-scale operations—including cyber operations—that are less visible and that do not require robust legislative support. These modern operations leave legislatures to engage in ex post and sometimes ineffective efforts to hold their executive branches accountable for international uses of force …

Autonomous Cyber Capabilities Below And Above The Use Of Force Threshold: Balancing Proportionality And The Need For Speed, Peter Margulies

International Law Studies

Protecting the cyber domain requires speedy responses. Mustering that speed will be a task reserved for autonomous cyber agents—software that chooses particular actions without prior human approval. Unfortunately, autonomous agents also suffer from marked deficits, including bias, unintelligibility, and a lack of contextual judgment. Those deficits pose serious challenges for compliance with international law principles such as proportionality.

In the jus ad bellum, jus in bello, and the law of countermeasures, compliance with proportionality reduces harm and the risk of escalation. Autonomous agent flaws will impair their ability to make the fine-grained decisions that proportionality entails. However, a …

Special Rules Of Attribution Of Conduct In International Law, Marko Milanovic

International Law Studies

Are there are any special rules of attribution in international law? Are there, in other words, imputational rules that are not recognized as such in general international law, but are specific to particular branches of international law? This is the first article to systematically analyze the notion of special rules of attribution in international law. In particular, it searches for such rules in international humanitarian law, the law on the use of force, and European human rights law.

The article argues that, to the extent special rules of attribution exist, they are rare and never uncontroversial. In most situations, putative …

Strategic Proportionality: Limitations On The Use Of Force In Modern Armed Conflicts, Noam Lubell, Amichai Cohen

International Law Studies

The nature of modern armed conflicts, combined with traditional interpretations of proportionality, poses serious challenges to the jus ad bellum goal of limiting and controlling wars. In between the jus ad bellum focus on decisions to use force, and the international humanitarian law (IHL) regulation of specific attacks, there is a far-reaching space in which the regulatory role of international law is bereft of much needed clarity. Perhaps the most striking example is in relation to overall casualties of war. If the jus ad bellum is understood as applying to the opening moments of the conflict, then it cannot provide …

The Unlawfulness Of A “Bloody Nose Strike” On North Korea, Kevin Jon Heller

International Law Studies

The United States has reportedly been debating whether to "react to some nuclear or missile test with a targeted strike against a North Korean facility to bloody Pyongyang’s nose and illustrate the high price the regime could pay for its behavior." This article asks a simple question: would such a “bloody nose strike” (BNS) violate the jus ad bellum?

Providing a coherent answer is complicated by the lack of clarity surrounding the United States’ planning. In particular, the U.S. government has not specified what kind of provocation it believes would justify launching a BNS, has not identified precisely what …

Twelve Key Questions On Self-Defense Against Non-State Actors, Terry D. Gill, Kinga Tibori-Szabó

International Law Studies

This article examines the most pertinent questions relating to the applicability of the right of self-defense to attacks conducted by non-State armed groups (NSAGs) acting independently of State control from the territory of one or more States against the territory of another State. These questions are approached from the perspective of legality (does the right of self-defense apply to attacks not mounted by or under the control of a State) and modality (assuming the applicability of self-defense to such attacks; how do the principles of necessity, proportionality and immediacy affect its application)? Starting with an assessment of the place of …

Silent War: Applicability Of The Jus In Bello To Military Space Operations, Kubo Mačák

International Law Studies

There are no molecules of air that could carry sound waves in the vacuum of outer space. Accordingly, space warfare may well become the first type of war whose signature sound would be—silence. But does the law of armed conflict (jus in bello) fall silent in times of Silent War? This article addresses the uncertainty at the heart of this issue. First, it delineates the relevant conceptual framework by examining the factual notion of “military space operations,” and its relationship with the legal concept of “armed conflict,” as well as the overlap between the potentially applicable bodies of …

Unilateral Non-Colonial Secessions: An Affirmation Of The Right To Self-Determination And A Legal Exception To The Use Of Force In International Law, Ilya Berlin

Electronic Thesis and Dissertation Repository

Secession has contributed to nearly 50 intra-state armed conflicts around the world, and remains a complex issue in public international law. Over the past 72 years, several cases stand out as providing evidence of state practice with regards to invoking a successful right to unilateral secession: Bangladesh, Croatia, South Sudan, East Timor, Eritrea and Kosovo, to name a few. However, apart from invoking a right to secession, these cases also share a common factor that legitimized their independence: their Unilateral Non-Colonial (UNC) secessions became legal as a result of two factors: (i) an invocation of a right to self-determination which …

The Future Of U.S. Detention Under International Law: Workshop Report, International Committee Of The Red Cross (Icrc), Harvard Law School Program On International Law And Armed Conflict (Hls Pilac), Stockton Center For The Study Of International Law (U.S. Naval War College)

International Law Studies

The International Committee of the Red Cross Regional Delegation for the United States and Canada, the Harvard Law School Program on International Law and Armed Conflict, and the Stockton Center for the Study of International Law at the U.S. Naval War College recently hosted a workshop titled Global Battlefields: The Future of U.S. Detention under International Law. The workshop was designed to facilitate discussion on international law issues pertaining to U.S. detention practices and policies in armed conflict. Workshop participants included members of government, legal experts, practitioners and scholars from a variety of countries. This report attempts to capture the …

Fragmented Wars: Multi-Territorial Military Operations Against Armed Groups, Noam Lubell

International Law Studies

Recent years have seen the emergence of significant legal debate surrounding the use of force against armed groups located in other States. With time, it has become clear that in many cases such operations are not confined to the territory of one other State, but expand to encompass multiple territories and often more than one armed group. This article examines multi-territorial conflicts with armed groups through the lens of several legal frameworks. Among other topics, it analyses the questions surrounding the extension of self-defense into multiple territories, the classification of the hostilities with the group and between involved States, the …

A Human Rights Perspective To Global Battlefield Detention: Time To Reconsider Indefinite Detention, Yuval Shany

International Law Studies

This article discusses one principal challenge to detention without trial of suspected international terrorists—the international human rights law (IHRL) norm requiring the introduction of an upper limit on the duration of security detention in order to render it not indefinite in length. Part One of this article describes the “hardline” position on security detention, adopted by the United States in the immediate aftermath of the 9/11 terror attacks (followed, with certain variations, by other countries, including the United Kingdom and the State of Israel), according to which international terrorism suspects can be deprived of their liberty without trial for the …

The Limits Of Inviolability: The Parameters For Protection Of United Nations Facilities During Armed Conflict, Laurie R. Blank

International Law Studies

This article examines the international legal protections for United Nations humanitarian assistance and other civilian facilities during armed conflict, including under general international law, setting forth the immunities of the United Nations, and the law of armed conflict (LOAC), the relevant legal framework during wartime. Recent conflicts highlight three primary issues: (1) collateral damage to UN facilities as a consequence of strikes on military objectives nearby and military operations in the immediate vicinity; (2) the misuse of UN facilities for military purposes; and (3) direct attacks on fighters, weapons or other equipment that cause damage to such facilities. To identify …

Classifying The Conflict In Syria, Terry D. Gill

International Law Studies

This article examines the classification of the current armed conflict in Syria under international humanitarian law. The article first sets out the factual background identifying the principal parties and their alignments and motivations. It then proceeds to examine the question of classification of conflict under international humanitarian law and discusses the contentious issue of the effect of lack of consent by the government of a State in relation to foreign intervention in an ongoing non-international armed conflict when such intervention is directed against one or more armed groups operating from within that State’s territory. It then proceeds to apply these …

Syria: Can International Law Cope? Workshop Report, Christopher M. Ford

International Law Studies

The Stockton Center for the Study of International Law at the U.S. Naval War College and the Center for the Rule of Law at the U.S. Military Academy convened a three-day workshop in November 2015. The workshop sought to examine the question posed by its title: Can International Law Cope with the Situation in Syria? It is a question that has ramifications for the viability of international law well beyond the confines of events in Syria. This report surveys the key issues that were raised during the workshop and serves as an introduction to the articles that follow in this …

Japan’S 2015 Security Legislation: Challenges To Its Implementation Under International Law, Hitoshi Nasu

International Law Studies

Japan’s new security legislation, enacted on September 30, 2015 amid fierce debate over its constitutionality, is designed to enable a “seamless response” to any security situation that may arise. While public debate has been fixated on the re-interpretation of Article 9 of the Japanese Constitution, which underpins the theoretical foundation of this new legislation, there are also important international law issues that need to be addressed. After briefly reviewing the historical background leading to the adoption of the new security legislation and its contents, this article examines how the Self-Defense Force (SDF) can respond with the use of force to …

Law, Rhetoric, Strategy: Russia And Self-Determination Before And After Crimea, Christopher J. Borgen

International Law Studies

The article considers how and why Russia has used international legal arguments concerning self-determination in relation to its intervention in Ukraine. Of what use is legal rhetoric in the midst of politico-military conflict? The article reviews the laws of self-determination and territorial integrity and considers Russia’s changing arguments concerning these concepts over the cases of Kosovo, South Ossetia, and Ukraine. Inasmuch as international law is the vocabulary and the grammar of modern diplomacy, States may use legal rhetoric with multiple audiences in mind. While the shifts in Russia’s arguments may be due to strategic needs in specific conflicts, the legal …

The Doctrine Of Legitimate Defense, Jens Ohlin

International Law Studies

The following article reorients mainstream conceptions of self-defense by defending a broader doctrine of legitimate defense that, in limited circumstances, justifies unilateral intervention. The source of the doctrine is natural law, which was explicitly incorporated into the text of UN Charter Article 51. The effect of this incorporation was to preserve, as a carve-out from the prohibition against force in Article 2, the natural law rights of defensive force. Specifically, the Article concludes that defensive force under natural law included, in extreme situations, a right of intervention in rogue States that refused to comply with natural law.

Defensive Force Against Non-State Actors: The State Of Play, Monica Hakimi

International Law Studies

This article assesses the implications of the current Syria situation for the international law on the use of defensive force against non-State actors. The law in this area is highly unsettled, with multiple legal positions in play. After mapping the legal terrain, the article shows that the Syria situation accentuates three preexisting trends. First, the claim that international law absolutely prohibits the use of defensive force against non-State actors is increasingly difficult to sustain. States, on the whole, have supported the operation against the so-called Islamic State in Syria. Second, States still have not coalesced around a legal standard on …

The Legality And Implications Of Intentional Interference With Commercial Communication Satellite Signals, Sarah M. Mountin

International Law Studies

Commercial communication satellite signals have become increasingly attractive targets for intentional interference by State and non-State actors. This article discusses the law applicable to satellite signal interference in peacetime, as well as during armed conflict. Specifically, the piece discusses the threshold at which intentional interference may constitute a use of force.

Charting The Legal Geography Of Non-International Armed Conflict, Michael N. Schmitt

International Law Studies

This article examines the geographical reach of international humanitarian law (law of armed conflict), particularly during armed conflicts between States and non-State organized armed groups. The issue is operationally critical, since to the extent that IHL applies, practices which are lawful during armed conflicts, such as status-based targeting, may be employed. When IHL does not apply, human rights obligations shouldered by the State govern the conduct of its military operations. The article surveys the various approaches to the the legal geography of non-international armed conflict, arguing that an interpretation by which IHL is not geographically restricted is the most supportable.

Methods And Means Of Cyber Warfare, William H. Boothby

International Law Studies

No abstract provided.

The Law Of State Responsibility In Relation To Border Crossings: An Ignored Legal Paradigm, Louise Arimatsu

International Law Studies

No abstract provided.

Cyber War And International Law: Concluding Remarks At The 2012 Naval War College International Law Conference, Yoram Dinstein

International Law Studies

No abstract provided.