In July 1995, Srebrenica fell to the combined forces of the Republika Srpska and numerous paramilitary formations which included hundreds of Greek and Russian volunteers in what was codenamed Operation Krivaja '95 (, Операција Криваја '95). The subsequent massacre of the town's male population led to the deaths of more than 8,000 Bosniak men and boys, and is considered the largest act of mass murder in Europe since the end of World War II. It was judged to have been a crime of genocide by international criminal courts. As a result, VRS General Radislav Krstić was found guilty by the International Criminal Tribunal for the former Yugoslavia (ICTY) of murder, persecution and aiding and abetting genocide, while VRS General Zdravko Tolimir was also convicted of genocide. Both men were sentenced to life imprisonment. One of the indictments against Ratko Mladić, the commander of the VRS during the war, is for the massacre in Srebrenica. The commander of Bosniak forces in the enclave, Naser Orić, was found guilty of failing to prevent the mistreatment of VRS prisoners held in Srebrenica between September 1992 and March 1993. However, his conviction was overturned in 2008.