It's worth remebering though that this was Stalin's plan to enlarge the Soviet Union (incidently also approved by the Western powers in the Yalta Agreement) at the cost of German territory. The expulsion of some millions of Poles from the territories of some newly created Soviet republics that now belong to Western Ukraine, Belarus and Lithuania is just as well a striking example of campaign of ethnic cleansing against the territories that had major Polish population for centuries. Morover, the Western Poland was subject to Prussian ethnic cleansing policies for more than a century, not to mention the war itself.