The Soviet Union, after the breaking of the Nazi–Soviet Pact by the instigation of Operation Barbarossa in 1941, greatly despised the unchallenged Japanese expansion in the East, particularly considering their defeat in several previous wars with Japan.
Uni Soviet, setelah melanggar Nazi–Soviet Pakta oleh dorongan dari Operasi Barbarossa pada 1941, sangat membenci tak tertandingi Jepang ekspansi di Timur, terutama mengingat kekalahan mereka di beberapa sebelumnya perang dengan Jepang.