[custom_adv] War crimes perpetrated by the Soviet Union and its armed forces from 1919 to 1991 include acts committed by the Red Army (later called the Soviet Army) as well as the NKVD, including the NKVD's Internal Troops. [custom_adv] In some cases, these acts were committed upon the orders of the Soviet leader Joseph Stalin in pursuance of the early Soviet Government's policy of Red Terror, in other instances they were committed without orders by Soviet troops against prisoners of war or civilians of countries that had been in armed conflict with the USSR, or they were committed during partisan warfare. [custom_adv] A significant number of these incidents occurred in Northern, Central, and Eastern Europe before, during and in the aftermath of World War II, involving summary executions and the mass murder of prisoners of war, such as in the Katyn massacre and mass rape by troops of the Red Army in territories they occupied. [custom_adv] When the Allied Powers of World War II founded the post-war International Military Tribunal to examine war crimes committed during the conflict by Nazi Germany, with officials from the Soviet Union taking an active part in the judicial processes, there was no examination of Soviet Forces' actions and no charges were ever brought against its troops, because they were also an undefeated power which then held Eastern Europe under military occupation, marring the historical authority of the Tribunal's activity as being, in part, victor's justice. [custom_adv] Today, the Russian government regularly dismisses the war crimes as "Western myth". In Russian history textbooks, the atrocities are either altered to portray the Soviets positively or omitted entirely. [custom_adv] In a June 2017 interview, Russian president Vladimir Putin acknowledged the "horrors of Stalinism", but he also criticized the "excessive demonization of Stalin" by "Russia's enemies". [custom_adv] At the end of World War II, many trials of Axis war criminals took place, most famously the Nuremberg Trials and Tokyo Trials. However, in Europe, these tribunals were set up under the authority of the London Charter, which only considered allegations of war crimes committed by people who acted in the interests of the Axis powers. [custom_adv] Some war crimes involving Allied personnel were investigated by the Allied powers and led in some instances to courts-martial. Some incidents alleged by historians to have been crimes under the law of war in operation at the time were, for a variety of reasons, not investigated by the Allied powers during the war, or were investigated and a decision was taken not to prosecute. [custom_adv] The Western Allies claim that their militaries were directed to observe the Hague Conventions and Geneva Conventions and believed to be conducting a just war fought for defensive reasons. Violations of the conventions did occur, however, including the forcible return of Soviet citizens who had been collaborating with Axis forces to the USSR at the end of the war. [custom_adv] Since many war crimes are not ultimately prosecuted (due to lack of political will, lack of effective procedures, or other practical and political reasons), historians and lawyers will often make a serious case that war crimes occurred, even if there was no formal investigations or prosecution of the alleged crimes or an investigation cleared the alleged perpetrators.