But the Poles did resist the Russian invasion.
SOME Poles resisted the Russian invasion . Losses were very low on both sides .
Some facts about the Soviet invasion
1 On September 17 1939 the Soviets invaded a part of Poland which was mainly inhabited by non Poles and which the Soviets claimed since 1920 .
2 The reason for this occupation was to avoid a German occupation which was considered as a mortal danger by the Kremlin (east Poland was the region of origin of Ukrainian nationalism and the OUN fought there against the Polish occupiers ).
3 During this invasion,there was a pogrom by Ukrainian nationalists and by communists against the ruling Polish intelligentsia . I have heard horrific stories .
4 Very quickly the Soviets organized a referendum ( of which the result was known in advance ) to ''legalize '' the annexation of the region .
5 The Soviets started also immediately with the epuration :the local Polish intelligentsia ( including civilians ) was arrested and put in prison .The reasons were that they were the cornerstones of the capitalist society and that they were hostile to the new regime.
It is wrong to think that the Katyn victims all were professional soldiers .
6 When Stalin ordered in April 1940 to kill a small minority ( 22000 of 350000) of the Polish political prisoners ( not POWs ) Poland and the USSR were not at war .Thus one can not talk about a war crime .
7 Such things happened also in 1945 when the Poles and the Soviets eliminated the German intelligentsia in East Prussia and Silesia when they conquered these regions .
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8 For the Russians Katyn was legal as the victims were now Soviet citizens and east Poland was now a part of the USSR .
For the Poles,it was a crime .
The opinion of other countries is irrelevant .