National Societies can assist their authorities in the development of international humanitarian law (IHL). This role has been consolidated in their mandate, especially through their auxiliary role in support of public authorities in the humanitarian field. This article recalls the main legal bases from which this role is derived. Based on the Belgian Red Cross experience, it demonstrates how the National Societies’ support to the promotion and national implementation measures of IHL can constitute an incentive for further elaboration of IHL treaties and policies. It also highlights their humanitarian diplomacy work to assist the International Committee of the Red Cross's approach at the international level. Finally, the article shares some thoughts to increase the Movement's collective impact in IHL development.

This article tries to imagine how the development of international humanitarian law (IHL) could continue despite current difficulties, increasing the ownership and contribution of States and armed groups in this process. After suggesting that some traditional assumptions about IHL may need to be abandoned, it tries to suggest a new way in which IHL rules could be developed, through States adopting together core obligations and principles and each State and armed group then specifying the details internally, but publicly. Finally, it stresses the importance and difficulties of involving non-State armed groups in this process.

This article offers a brief review of the forces that have contributed to the contemporary impasse in the formation of new international law and institutions. It identifies areas where development of the law of armed conflict would provide great benefits, yet where current international conditions render formal legal agreements highly unlikely. It then considers how to advance desirable projects nonetheless. In the absence of effective formal international law-making, jurists face a choice. One approach, which I call inspirational, is to propose idealized legal systems based on claims of justice and practicality. Much published work over the last decade seems to take this path. The hope is that the ideas will inspire and thus lead relevant actors to adopt the systems at a time when the obstacles to international agreements recede. The other approach, which I call entrepreneurial and describe here, involves leading States acting as “norm entrepreneurs”. They can propound and in practice adhere to norms with the intention of inducing other States to follow. The entrepreneurial approach entails a State engaging in a practice that it hopes others will emulate, while the inspirational involves an appeal to the international community as a whole, including significant non-State actors.

Military strategists have begun pivoting from a focus on counterterrorism, counter-insurgency and stability operations to potential peer and near-peer conflict. This shift has profound operational and tactical implications for how future wars will be fought, but equally, it will have a significant impact on how international humanitarian law (IHL) is understood and applied. This article considers the process by which the normative evolution of IHL will occur in response to a battlespace that looks different than it has for decades. To do so, the article introduces two concepts: “normative architecture” and “applied IHL”. It argues that only by understanding the difference between these two concepts, and their relationship to each other, can States and others concerned with how IHL is developing in the face of future conflict positively affect that process.

Over the last two decades, international humanitarian law (IHL) has seen a stalling with regard to States’ willingness to adopt treaties or to be formally involved in the development of IHL. This raises the question of whether holding on to the doctrine of sources as laid down in Article 38 of the Statute of the International Court of Justice is the only way to meaningfully further develop IHL. Indeed, in recent years IHL instruments have often dispensed with certain formalities that are traditionally linked to (the formal sources of) international law; this phenomenon is also called “informal international law-making” (IIL). The present contribution will analyze IIL as an alternative way forward in light of the current “deadlock” caused by States’ unwillingness to conclude new IHL treaties or to recognize customary IHL. In this article, we will investigate and assess the opportunities, shortcomings and pitfalls offered by informality by looking into examples of IIL within IHL. More concretely, we will look into State practice in relation to (1) the Safe Schools Declaration, (2) the Tallinn Manual and Tallinn Manual 2.0, and (3) the Montreux Document. Most importantly, our findings will assess whether IIL can overcome one of its alleged main disadvantages: its lack of effectiveness.

Military technology has developed rapidly in recent years, and this development challenges existing norms. It has produced countless debates about the application of international humanitarian law (IHL) to areas of war and technology including cyber military operations, military artificial intelligence (including autonomous weapons), the use of drones, and military human enhancement. Despite these rapid progressions, the prospect of creating new treaties to specifically regulate their use by militaries and in armed conflicts is very low. This is largely due to the unequal allocation of military technology among States and the differing interests that result from this inequality. The absence of formal regulation means that State and non-State actors are increasingly embracing informal means of law-making. This is similar to other areas of IHL, such as the regulation of asymmetric conflicts, where norms are contested. In such cases, State and non-State actors employ various informal law-making techniques to advance their normative positions through treaty interpretation and the identification of customary international law.

However, the discussion on military technology differs from other contemporary IHL debates. First, due to the rapid development of such technology and uncertainty about how it will be employed in practice, the interests of the various actors are less clear. Second, there are significant challenges in obtaining accurate information about new military technologies. This makes even the informal law-making path in the context of new technologies more challenging.

This paper explores the dynamics of contemporary international law-making as it relates to the regulation of new military technologies. It identifies the main techniques that are used by the relevant actors and explores the common themes among the various debates over military technology, as well as the potential specific challenges in relation to certain technologies.

Traditionally, international humanitarian law (IHL) is conceptualized as a body of mutually binding, horizontal international legal rules that are agreed upon by States and that govern the relationships between parties to armed conflicts. Yet, there is discernible evidence that contemporary IHL – and the broader normative environment that pertains to the regulation of armed conflicts in which it is situated – is incorporating elements of unilateralization, manifested in legal and non-legal norms that regulate armed conflicts taking the form of commitments whose validity is not dependent on being reciprocated. This article examines some of the systemic implications of unilateralization of IHL and considers its pitfalls and potential.

In the declaration on the commemoration of the seventy-fifth anniversary of the United Nations, Member States requested that the Secretary-General provide recommendations to advance “Our Common Agenda” and to respond to current and future challenges. The Secretary-General issued a report entitled “Our Common Agenda” on 5 August 2021, which, among others, reinforces the role of the United Nations as a place of choice for the development of international law, also putting in context the role and specific prerogatives of the Secretary-General in the promotion of international law. The declaration and “Our Common Agenda” have also presented an opportunity to counter sentiments regarding a supposed general decline in respect for international law.