Ka Lok Yip

This article examines, through a theoretical lens, two issues concerning equality under international law thrown up by the ongoing Russo-Ukrainian War: the equal treatment of belligerents on different sides under international humanitarian law (IHL), which is being contested by revisionist just war theorists, and the unequal treatment of Ukrainians with different genders assigned at birth who are trying to flee Ukraine, which is being contested under international human rights law (IHRL). By examining different conceptions of equality through the lens of social ontology, this article distinguishes between the regulatory focus of IHL on individual agency and the regulatory focus of IHRL on social structures, which directly influence how ‘difference’ and ‘sameness’ are recognized and determined for the purpose of conceptualizing equality. Because of IHL’s focus on individuals, whose agency is limited in war, only highly agential conduct (e.g. targeting civilians) makes a ‘difference’ under IHL. Meanwhile, outside IHL’s regulatory focus, the different causes of states’ participation in war are evened out as the ‘same’ structured positions occupied by different individuals, warranting their same treatment according to belligerent equality. On the other hand, because of IHRL’s focus on social structures, which heavily condition the individuals, structural arrangements make a ‘difference’ under IHRL. Outside IHRL’s regulatory focus, individuals’ different innate characteristics such as sexual characteristics are evened out as the ‘same’ agential quality of being human, warranting their same treatment according to sex equality. The article argues that the contestations about these equality principles find deeper roots in their divergent social ontological visions, the revelation of which can open up new spaces for dialogue on and inquiry into a common social world that grounds the legal conceptions of equality.