According to Boris Makarenko , deputy director of the Moscow-based think tank Center for Political Technologies , much of the modern anti-Russian feelings in Poland is caused by grievances of the past . One contentious issue is the massacre of 22,000 Polish officers , priests and intellectuals in Katyn Forest in 1940 , and deportation of around 250,000 mostly Polish civilians and others including soldiers to Siberia and Kazakhstan where many , around 100,000 died , even though the Russian government has officially acknowledged and apologized for the atrocity
Katyn Forest
Katyn massacre
Anti-Russian sentiment