This study investigates the legal and ethical challenges posed by cyber warfare in the ongoing Russian-Ukraine war. Cyber warfare represents a transition from traditional conflict dynamics, impacting civilian populations and national security without direct physical confrontations. The significance of this research is the inadequacy of current legal norms that govern the rapidly evolving techniques of cyber-attacks which challenge established norms of International Humanitarian Law. Hence, the research question explores how cyber warfare challenges existing legal and ethical norms for civilian protection, and what the broader implications are for the regulation of modern conflicts. Through a qualitative case study approach, the thesis analyses three cases of Russian cyber-attacks on Ukrainian civilian infrastructure: the 2015 attack on the Ukrainian power grid, the 2023 cyber-attack on Kyivstar, and the 2022 Asylum Ambuscade. In the simplified legal framework by Hoffman and Rumsey, these cases were analysed using the Tallinn Manual, and Mary Kaldor’s New Wars theory to highlight the challenges and violations of IHL. The findings conclude that the IHL framework is insufficient for the unique challenges of cyber warfare. Moreover, the study addresses for the revaluation and updating of international legal norms to keep up with the constant development of cyber warfare. In all, this thesis showcases the need for enhanced legal standards that can safeguard civilian populations and maintain international security, contributing to the fields of international law and conflict resolution.