Would the Soviet Union eventually attack Germany in this scenario?
Short answerPossibly, but Soviet moves in Poland could also provoke Britain and France; Moscow might disguise its position through a nominally independent Polish state, and any advance would still face major logistical limits.
NotesSoviet intervention against Germany remains possible rather than certain. An attack intended to secure all of Poland could collide with Anglo-French commitments and create a separate war. Moscow might instead withdraw formally and establish a nominally free Polish state under Soviet influence. A later Soviet offensive would still face transport limits: domestic trucks existed, but Lend-Lease vehicles and railway development were especially valuable for last-mile logistics.