On 28 June 1940 , soon after the Katyn massacre , Stalin received Wanda Wasilewska , an unofficial leader of Polish communists , at the Moscow Kremlin . The event initiated a reorientation of Soviet policies in regard to Poles . As a result a wide range of official political , military , social , cultural , educational and other Soviet-Polish projects and activities commenced in 1940 and continued during the years that followed
Katyn massacre
Katyn massacre
Polish Workers' Party