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POLAND - APRIL 01: Professor Francois Naville, Director Of The Medical And Legal Institute Of The Geneva University, Stands Next To A Polish Corpse Into The Mass Grave Where The Katyn Victims Have Been Found. About 4500 Polish Officers Are Found Dead, Shot In 1940 - 1941 By The Soviets, By The Germans In The Katyn Forest (Ussr) In 1943. This Massacre Was Carried Out Under A Stalin Order On March 1940 Which Led To The Execution Of Nearly 26 000 Polish, Civil And Military Population Alike. (Photo by Keystone-France/Gamma-Keystone via Getty Images)

POLAND - APRIL 01:  Professor Francois Naville, Director Of The Medical And Legal Institute Of The Geneva University, Stands Next To A Polish Corpse Into The Mass Grave Where The Katyn Victims Have Been Found. About 4500 Polish Officers Are Found Dead, Shot In 1940 - 1941 By The Soviets, By The Germans In The Katyn Forest (Ussr) In 1943. This Massacre Was Carried Out Under A Stalin Order On March 1940 Which Led To The Execution Of Nearly 26 000 Polish, Civil And Military Population Alike.  (Photo by Keystone-France/Gamma-Keystone via Getty Images)