Their mandate was to study possible violations of international humanitarian law, human rights, as well as war crimes and crimes against humanity. OSCE experts state the conditions of detention of prisoners of war do not meet international standards: overcrowded premises, lack of proper medical care, nutrition and hygiene. Ukrainian prisoners of war are deprived of the opportunity to communicate with their families, and access by the International Committee of the Red Cross is severely restricted. Such actions may constitute war crimes and crimes against humanity. The mission concluded that Russia bears responsibility for large-scale and systematic violations of international law in the treatment of Ukrainian prisoners of war.