Military support to Ukraine has been accompanied by debates as to when Western states would find themselves ‘at war’ with Russia. This political and legal discourse reminds us that international law needs concepts to identify who is a party to an international armed conflict. Identifying parties is crucial because the international legal regulation of armed conflict remains, in many ways, structured by reference to party status – even if the legal meaning of being a party today differs significantly from the traditional implications of being ‘at war’. To capture the increasingly complex co-operation patterns of today’s and tomorrow’s wars, this article identifies the contours for a framework of legal criteria for establishing when a state has become a party to an ongoing international armed conflict. To become a party under this framework, a state must knowingly make a contribution to the conflict that is of a character such that it is directly connected to harm caused to the adversary. That contribution must be sufficiently closely co-ordinated with fellow parties to allow for involvement in the decision-making processes regarding co-ordinated military operations. Applying these criteria to key support scenarios, as exemplified in Russia’s war against Ukraine, permits reasonable distinctions, also with a view to future conflicts. More widely, the analysis of party status may enhance our understanding of the architecture of the international legal regulation of armed conflict as a whole, and its ability to respond to the realities of contemporary conflicts.

Mandatory human rights due diligence (HRDD) laws in the European Union (EU) – both enacted and in the making – seem to be a promising tool to harden soft international standards in the business and human rights (BHR) field, the most prominent of these being the UN Guiding Principles on Business and Human Rights (UNGPs). This article develops a two-layered critique of mandatory HRDD laws. It problematizes the very concept of HRDD as articulated by the UNGPs. I will argue that due to various conceptual, operational and structural limitations, HRDD alone will not bring the desired changes for rightsholders, because this process does not address various asymmetries of power between corporations and affected communities. The second layer of critique concerns the content of mandatory HRDD laws enacted in France, the Netherlands, Switzerland, Norway and Germany. Assessing these laws vis-à-vis six preconditions required to protect effectively people and the planet from business-related harms, it is clear that these mandatory HRDD laws are half-hearted attempts to tame business-related human rights abuses and hold the relevant corporate actors accountable. In addition to developing more ambitious mandatory HRDD laws in future, states should employ a range of additional regulatory tools that pay greater attention to achieving outcomes, drawing red lines in certain situations, and promoting access to remedy and corporate accountability.

The international investment and tax law regimes are undergoing a process of significant reforms that seek to address existing shortcomings of the mechanisms used for the resolution of investment and tax treaty disputes. These reforms show that policymakers are gradually adopting a fragmented approach towards dispute settlement in both fields, with the establishment of different and unco-ordinated mechanisms. This article argues that, instead of fragmenting investment and tax dispute settlement, states should consider establishing a more unified and coherent framework in order to more adequately mitigate the concerns raised in each field.

This article assesses the implications of national climate litigation for what is termed ‘the international rule of law’. Starting from the finding that the current international climate treaty regime lacks several elements of an international rule of law, such as legal bindingness, clarity, and justiciability, the author explores what national courts contribute to filling these gaps. Deviating from a linear progression narrative, which is prevalent in existing literature, this article provides a more nuanced and complex picture. Whereas successful climate litigation is hardly imaginable without reliance on internationally agreed-upon facts – such as reports by the Intergovernmental Panel on Climate Change and global average temperature levels deemed ‘dangerous’ – doctrinally decisions do not represent a turn toward a stricter rule of international climate law. Instead of applying and progressively developing climate treaties, courts thus far have primarily used these provisions only to develop national constitutional law and regional human rights law. The created system of highly contextual national rule(s) of climate law is a fragmented one which is regionally limited to a few states predominantly located in Western Europe. Consequently, it is a far cry from a truly global rule of international climate law.

Human rights violations by corporations are widespread and have a broad spectrum: damage to people’s health through pollution, environmental accidents and health and safety failures, forced labour or child labour, underpaid workers, displaced communities, contaminated water sources, use of excessive force, and discrimination, for example by race, gender or sexuality. Corporate violence, resulting from a long history of corporate power and colonialism continues today as corporations have grown into powerful global conglomerates. Through complex and opaque multinational groups and supply chains, use of corporate law concepts such as the corporate veil, as well as other actions such as tax avoidance and lobbying of national and international political institutions, corporate actors remain free to pursue their goals. Despite efforts to combat corporate harm through the development of a business and human rights movement success has been limited and significant gaps remain in the global governance required to ensure protection. This article argues that, similar to a cat and mouse game, corporations find new ways to defend themselves against those seeking to dismantle their power or to prevent human rights infringements. The problem is rooted in structural and systemic inequalities within the international legal framework and in company laws that maintain corporate structures that obstruct the human rights movement’s progress. The current drive towards a more sustainable business agenda requires a just transition, including transformation of global and corporate structures to tackle human rights violations and the inequalities of power and wealth that facilitate such violations.