This contribution enquires into the relevance of the human security perspective in the analysis of the humanitarian situation created by the Russian war of aggression against Ukraine. For this purpose, it will first characterize the war in Ukraine from an international legal perspective, and then introduce the main elements of the human security approach in order to apply it in a third step to the war in Ukraine. In this context the relevance of fact-finding on violations of International Humanitarian Law and human rights will be highlighted. The focus on vulnerabilities and a victim-oriented approach allows to better identify the threats to the security of people, in particular of vulnerable groups. The use of multilateral tools and the empowerment of civil society can help to provide assistance against the suffering and prepare for accountability for war crimes and human rights violations.