This is an absolutely non valid POV. The Polish government still existed back on the 17th of September when the USSR invaded, and Russia and Poland has signed a treaty of non-aggression that was renewed for 10 years in 1934 and was still claimed to be valid by both parties back in 1938.
There's no way you can deny that the USSR invaded a state of Poland that still existed and was still fighting against aggressors right when Russia troops passed the frontier.
Note that your comment is actually pure propaganda from Staline's himself (this is exactly what the USSR claimed when they invaded Poland, and they presented themselves as liberators and protectors instead of invaders). Of course, you should know better than to trust the communist propaganda.
There's no way you can deny that the USSR invaded a state of Poland that still existed and was still fighting against aggressors right when Russia troops passed the frontier.
One source, out of many: https://gallica.bnf.fr/ark:/12148/bpt6k4437527/f1.item.zoom
Note that your comment is actually pure propaganda from Staline's himself (this is exactly what the USSR claimed when they invaded Poland, and they presented themselves as liberators and protectors instead of invaders). Of course, you should know better than to trust the communist propaganda.