He also claims that, while this is not the only Soviet genocide (e.g. The Polish operation of the NKVD), it is the worst in terms of mass casualties.[40]Current estimates on the total number of casualties within Soviet Ukraine range mostly from 2.2 million[56][57] to 4 to 5 million.[58][59][60]An Ukrainian court found Josef Stalin and other leaders of the former Soviet Union guilty of genocide by