This large Polish population dramatically decreased in the late 1930s and 1940s after the Soviet occupation of eastern Poland ( see : Soviet invasion of Poland ) , as a result of Soviet mass deportation of Poles to Siberia and other eastern regions of the USSR as well as a campaign of ethnic cleansing , carried out by Ukrainian nationalists ( see : Massacres of Poles in Volhynia and Eastern Galicia )
Massacres of Poles in Volhynia and Eastern Galicia
Massacres of Poles in Volhynia and Eastern Galicia
Poles in Ukraine