What if during Russian Civil War, Poland had not decided to invade western lands and spark Polish-Soviet War, thus preventing it from gaining Western Belarus and Ukrainian lands? How would it go? Would Stalin later retry to take all of Poland or he'd leave it alone like he did after Treaty of Riga and with other countries like the Baltics and Finland? In this situation, would Hitler still invaded the smaller Poland? How would Stain react to Hitler invading Poland while still controlling Western Belarus and Ukraine? Would Stalin help out Poland against Hitler since he had nothing to take since Poland in this timeline doesn't own Western Ukraine and Belarus? Or he'd still try to take all of Poland?