Foreign Fighters in the Framework of International Armed Conflict Between Russia and Ukraine

The centennial of the Hague Convention (No. II; No. IV in the 1907 version) on the Laws and Customs of War on Land and the fiftieth anniversary of the four Geneva Conventions for the Protection of Victims of War of August 12, 1949, present an opportunity to reflect on the direction in which the law of war, or international humanitarian law, has been evolving. This essay focuses on the humanization of that law, a process driven to a large extent by human rights and the principles of humanity. As the subject is vast, major issues must inevitably be left out of my discussion, including the impact of the prohibitions on unnecessary suffering and indiscriminate warfare on the regulation of weapons, the proscription of antipersonnel land mines and blinding laser weapons, and the progression of international humanitarian law from largely protecting noncombatants to protecting combatants as well.

International human rights law and international humanitarian law are traditionally two distinct branches of law, one dealing with the protection of persons from abusive power, the other with the conduct of parties to an armed conflict. Yet, developments in international and national jurisprudence and practice have led to the recognition that these two bodies of law not only share a common humanist ideal of dignity and integrity but overlap substantially in practice. The most frequent examples are situations of occupation or non-international armed conflicts where human rights law complements the protection provided by humanitarian law. This article provides an overview of the historical developments that led to the increasing overlap between human rights law and humanitarian law. It then seeks to analyse the ways in which the interplay between human rights law and humanitarian law can work in practice. It argues that two main concepts inform their interaction: The first is complementarity between their norms in the sense that in most cases, especially for the protection of persons in the power of a party to the conflict, they mutually reinforce each other. The second is the principle of lex specialis in the cases of conflict between the norms.