Law Commons^™

Cyberspace And The Jus Ad Bellum: The State Of Play, Michael N. Schmitt, Anusha S. Pakkam

International Law Studies

This article examines how States are interpreting one aspect of the international law governing cyber activities, the jus ad bellum. The article focuses on two issues: (1) the prohibition on the use of force found in Article 2(4) of the UN Charter, and (2) the right of self-defense in Article 51. The critical unsettled question regarding the first issue is the threshold at which a hostile cyber operation can be characterized as a “use of force” subject to the prohibition of Article 2(4). Concerning the second issue, a number of unresolved questions plague the application of the right of …

“Unwilling Or Unable”, Lucy V. Jordan

International Law Studies

Critics of the unwilling or unable doctrine suggest that it could undermine the United Nations collective security system and argue that it requires an unacceptable ceding of a State’s territorial sovereignty. Increased reliance on the doctrine following the terrorist attacks of 9/11, particularly in relation to the use of force against ISIL in Syria since 2014, has caused the doctrine to face significant scrutiny. The purpose of this article is to ascertain whether the unwilling or unable doctrine has reached customary international law status. If found to be the case, the doctrine would confirm the right of States to act …

Re-Imagining The Post-9/11 Authorizations For Use Of Military Force In The Era Of Emerging Consensus On Reform, Peter J. Amato

Journal of Legislation

No abstract provided.

The Lessons Of 9/11 For October 7, Mary Ellen O'Connell

NDLS in the News

October 7 is being called Israel’s 9/11. The comparison is apt for the lessons that can be learned as to the legality of launching a ground offensive to respond to terrorism.

Aid And Assistance As A “Use Of Force” Under The Jus Ad Bellum, Michael N. Schmitt, W. Casey Biggerstaff

International Law Studies

Although the prohibition of the use of force is a cornerstone of international law, our understanding of what constitutes a “use of force” under Article 2(4) of the UN Charter nonetheless continues to evolve. While the term was traditionally understood to mean armed force, emerging interpretations are expanding our understanding of the prohibition’s breadth. The Charter’s text, travaux préparatoires, and subsequent interpretations and practice by States, reinforced by the persuasive reasoning of the International Court of Justice, all confirm that the notion of force extends to indirect force, which includes military support provided to parties to a conflict. Yet, to …

Twenty Years Of Drone Attacks, Mary Ellen O'Connell

NDLS in the News

On November 2, 2002, the United States conducted its first targeted killings using a drone. CIA agents based in Djibouti launched the drone’s two Hellfire missiles at a vehicle traveling in rural Yemen, killing six...

Some Reflections On The Threshold For International Armed Conflict And On The Application Of The Law Of Armed Conflict In Any Armed Conflict, T.D. Gill

International Law Studies

This essay discusses the threshold of application of international humanitarian law (IHL) in both international (IAC) and non-international armed conflicts (NIAC). In relation to IAC it questions whether the International Committee of the Red Cross (ICRC) “first shot” approach is the most appropriate, since it opens the way for the intensification of conflicts beyond what is necessary in relation to relatively minor armed incidents and argues that the humanitarian protection clauses of IHL should be separated from the rules governing hostilities and makes a case for the application of ad bellum considerations of necessity and proportionality to act as a …

The Prohibition On Intervention Under International Law And Cyber Operations, Ori Pomson

International Law Studies

Given that cyber technologies have made way for attempts to influence the affairs of other States in novel and unique ways, scholars have turned to the international legal rule which is prima facie most relevant in addressing such meddling; namely, the prohibition on intervention. Moreover, there appears to be quite a wide-ranging consensus in scholarship that the prohibition on intervention applies to a broad range of cyber operations. In contrast to such scholarship, this article argues that, under the lex lata, the prohibition on intervention only applies to acts amounting to a use of force or constituting support for …

Revisiting Ad Bellum Proportionality: Challenging The Factors Used To Assess It, Yishai Beer

International Law Studies

Traditionally, international law has established a binary distinction between jus ad bellum and jus in bello. The former relates to the right to exercise military force. The latter regulates the conduct of adversaries engaged in an armed conflict. However, the prevailing legal approach doesn't accept this dichotomy. It wants to reduce war's hazards by applying the ad bellum rules, including the proportionality requirement, continuously throughout the conduct of armed conflict. To that end, it has established factors that define the essence of the continuing ad bellum proportionality requirement. This article challenges the near-unanimous consensus regarding these factors. It argues that …

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 …

Developing International Guidelines For Protecting Schools And Universities From Military Use During Armed Conflict, Steven Haines

International Law Studies

One consequence of armed conflict, especially that of a non-international character, is serious damage done to vital societal infrastructure. Education–schools and universities–can be severely disrupted, even subject to attack. Targeting of schools may not invariably be unlawful if educational facilities are being put to military use. Such use may itself not be unlawful but it can result in schools being transformed from civilian objects into military objectives–and subject, therefore, to lawful targeting. This was a problem highlighted by humanitarian NGOs a decade ago and led to the formation, by both NGOs and United Nations agencies, of the Global Coalition to …

Legal Reviews Of War Algorithms, Tobias Vestner, Altea Rossi

International Law Studies

States and scholars recognize legal reviews of weapons, means or methods of warfare as an essential tool to ensure the legality of military applications of artificial intelligence (AI). Yet, are existing practices fit for this task? This article identifies necessary adaptations to current practices. For AI-enabled systems that are used in relation to targeting, legal reviews need to assess the systems’ compliance with additional rules of international law, in particular targeting law under international humanitarian law (IHL). This article discusses the procedural ramifications thereof. The article further finds that AI systems’ predictability problem needs to be addressed by the technical …

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 …

Israel’S Perspective On Key Legal And Practical Issues Concerning The Application Of International Law To Cyber Operations, Roy Schöndorf

International Law Studies

The speech given by the Israeli Deputy Attorney General (International Law) at the Naval War College’s event on “Disruptive Technologies and International Law” sets out, for the first time, Israel’s position on the application of international law to cyber operations. Consistent with the position taken by the vast majority of States thus far, Israel considers that international law applies to such operations. The speech stresses that questions pertaining to the identification and application of relevant legal rules remain, given the profound differences between the cyber domain and traditional domains of warfare—land, sea, and air. Therefore, in Israel’s view, a cautious …

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 …

The Interplay Of International Obligations Connected To The Conduct Of Others: Toward A Framework Of Mutual Compliance Among States Engaged In Partnered Warfare, Berenice Boutin

International Law Studies

This article examines international obligations that arise in relation to the conduct of other States, and analyzes how they apply and interact in the context of partnered warfare. It investigates rules of State responsibility relevant to the context of partnered warfare, as well as primary norms that impose obligations connected to the conduct of others. In essence, they consist of obligations not to actively help to or to blindly let others do what a State would not do itself. It is argued that, taken together, these rules form the contour of an overarching framework of mutual compliance among States cooperating …

An Incident In The South China Sea, Rob Mclaughlin

International Law Studies

This article assesses characterization issues under the law of the sea, through the medium of an International Law Studies “maritime situation.” The article begins with a hypothetical scenario concerning an incident between a NATO warship and PRC vessels near Subi Reef and Thitu Island in the South China Sea. The analysis then turns to how we might assess characterization issues under the law of the sea as they apply to this incident. The lenses of analysis employed are: (1) Where, in law of the sea terms, did the incident happen? (2) Who, employing a law of the sea characterization scheme, …

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 …

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 …

The Killing Of Soleimani And International Law, Mary Ellen O'Connell

NDLS in the News

On 3 January, missiles launched from a United States Reaper drone struck two vehicles leaving Baghdad’s international airport. At least seven people died in the attack, including the commander of Iran’s Quds force, General Qassem Soleimani. On 5 January, Iranian Major General Hossein Dehghan, reported to be the military adviser to Iran’s Supreme Leader, gave an exclusive interview to CNN and said Iran “would retaliate directly against US ‘military sites.’”

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 …

Adverse Cyber Operations: Causality, Attribution, Evidence, And Due Diligence, Hans-Georg Dederer, Tassilo Singer

International Law Studies

Adverse cyber operations against States are on the rise, and so are the legal challenges related to such incidents under public international law. This article will not delve into already intensely debated problems of classification, such as whether adverse cyber operations constitute “armed attacks” or “use of force.” Rather, the article will focus on causality and attribution with special regard to problems of evidence. In particular, the article will elaborate on the applicable standards of proof to be met by the victim State when submitting, or having to submit, evidence to justify self-defense or countermeasures against the State of origin. …

Drone Attacks On Saudi Aramco Oil Installations, Mary Ellen O'Connell

NDLS in the News

Half of Saudi Arabia’s oil production has been stopped by air attacks involving drones and possibly cruise missiles on 14 September 2019. Houthi rebels in Yemen have claimed responsibility. United States Secretary of State Mike Pompeo has asserted by tweet that Iran is responsible because there is “no evidence the attacks came from Yemen” and Iran is behind “100” attacks on Saudi Arabia. The U.S. has since released satellite imagery showing immense smoke clouds. Unnamed American officials say 19 sites were struck. According to the BBC, on 16 September, ‘UK, Foreign Secretary Dominic Raab said it was not …

The Legal Fog Of An Illusion: Three Reflections On "Organization" And "Intensity" As Criteria For The Temporal Scope Of The Law Of Non-International Armed Conflict, Jann K. Kleffner

International Law Studies

The "organization" of the non-State armed group and the "intensity" of the violence between it and its opponent(s) have emerged as the two key criteria to determine the temporal scope of the law of non-international armed conflict. These criteria have served to lift the fog of law in some important respects. Yet, several aspects of the temporal scope of the law of non-international armed conflict remain unsettled. This article addresses three of them, namely the assertion that the factors for ascertaining organization and intensity that have evolved in the jurisprudence of international criminal courts and tribunals are indicative rather than …

Indeterminacy In The Law Of Armed Conflict, Adil Ahmad Haque

International Law Studies

Controversy and confusion pervade the law of armed conflict. Its most basic rules may seem ambiguous, vague, incomplete, or inconsistent. The prevailing view of customary international law confronts serious problems, in principle and in practice, when applied to the customary law of armed conflict. Legal indeterminacy, in its different forms, might be reduced or resolved in light of the object and purpose of the law of armed conflict, or by taking into account other relevant rules of international law. Unfortunately, the purpose of the law of armed conflict is itself the subject of deep disagreement. So is the relationship between …

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 …