Annotation: Provides a comprehensive analysis of current approaches to the investigation of war crimes in Ukraine in the context of the ongoing war and intensification of aggressive actions on its territory. Particular attention is paid to the challenges faced by pre-trial investigation bodies, in particular those related to global geopolitical changes, legal and regulatory gaps, as well as security issues, tactical difficulties and logistical challenges in collecting evidence and conducting investigative actions. The author systematizes the main problems and barriers faced by law enforcement agencies and proposes new approaches to overcome them.