'''Katyn & Katyn Forest Massacres''' https://archive.is/uX6kP
 	
Several kilometers west of Smolensk lies the Katyn Forest. Early in World War II, 
Early in World War II, the Soviets had a non-aggression pact with Germany and both countries invaded Poland in September 1939. 
The "Katyn massacre" was a series of massacres of Polish soldiers, police officers and Polish Intelligentsia, consisting of professors, 
doctors, lawmakers by the NKVD (Soviet Secret Police) on direct orders of Joseph Stalin. The number of victims is estimated at very close to 22,000. 
Only a few thousand were actually executed in the Katyn Forest, but there are mass graves and a memorial was dedicated
[https://www.findagrave.com/memorial/57962200/monument-for_the_victims_of-katyn/flower][https://www.findagrave.com/memorial/57962200/monument-for_the_victims_of-katyn].

Both countries had no balls to attack Poland separately fearing they would get their asses whooped and Soviets/Russians did not forget
The Polish-Bolshevik War, especially in the Battle of Warsaw, August 1920, when they were crushed.