The creative impetus for conducting scientific research on the topic of the study was a rather underdeveloped layer of activity of pre-trial investigation bodies in documenting a certain category of war crimes. At present, we are talking about violations of the laws and customs of war in the context of studying one of the forms of the objective side of a criminal offense - cruel treatment of prisoners of war combined with premeditated murder. Considering the difficult situation with the release of Azovstal's defenders into "honorable captivity," a decision that was made at a high state level and lasted from May 16 to 21, 2022, it should be noted that all expectations regarding the implementation of the humanitarian component in accordance with the norms of International Humanitarian Law have not been met. So far, we have received completely different consequences of the desired rescue of the military, who were actually trapped in an enemy trap. Thus, on the night of July 29, 2022, in the former Volnovakha Penal Colony No. 120, located in the village of Molodizhne of the Olenivka Village Council of the Donetsk region (temporarily occupied territory), Russian occupation forces committed a terrorist act, which, according to official data, killed 53 and wounded more than 130 prisoners of war from among the defenders of Azovstal. According to the Ombudsman Dmytro Lubinets, "This is a public execution of officially confirmed, verified Ukrainian prisoners of war who were taken prisoner. According to the Geneva Convention, they were confirmed through the verification procedure by the International Committee of the Red Cross. They were representatives of one military unit of the National Guard of Ukraine..." Unfortunately, due to the complicated and actually suspended exchange of prisoners of war by the occupation authorities, cases of murder (extrajudicial executions) and torture of our military in captivity have become more frequent. Therefore, one of the main tasks of pre-trial investigation bodies should be to tactically correctly and timely document a war crime that is rather complex in its design -- violation of the laws and customs of war in the form of ill-treatment of prisoners of war, if it is combined with intentional murder. The timely and correct qualification of such an act should help improve the tactics and methods of investigation by addressing the practical challenges that arise during the pre-trial investigation. First and foremost, it is necessary to ensure clear interaction between several law enforcement agencies (the National Police of Ukraine and the Security Service of Ukraine), whose activities overlap in the plane of jurisdiction. Law enforcement agencies should not only continue each other's work, but also initiate pre-trial investigations with a clear understanding of the basic algorithm of coordinated actions to prevent loss of evidence with the possibility of further use of the collected evidence in the International Criminal Court. Judicial practice on this issue is currently being formed, but despite this, it is necessary to create and develop a unified algorithm of actions that should be based on the exclusive legality of the evidence obtained. The scientific research conducted in this under-researched area, reinforced by practical experience, will contribute to a deeper understanding of the issues of peculiarities of criminal law qualification and tactics of certain procedural actions during pre-trial investigation in criminal proceedings on the facts of violation of the laws and customs of war, if they are combined with premeditated murder, where the form of the objective side is cruel treatment of prisoners of war. The provisions proposed in this article are intended to be recommendatory for synergy in the work of specialists of pre-trial investigation units and the prosecutor's office in formulating an algorithm for proving the above facts. [ABSTRACT FROM AUTHOR]