Politics, politics...??
The war was almost over in Poland as the Russians entered the country, I think. Maybe it was not seen as an attack but a take over, or even better saving the eastern side of Poland from Germany?? How wrong they would have been, as the Russians had big lists of who to shoot and put into prison as political enemies of the party.They gave the lists willingly to Germans as well.

Also it might be that the western allied at that moment had negotiations with Russia still going on under cover, although Stalin was still confirmed on the pact with Germany being the one he stood with. Thus they did not want to risque these talks by declaring war, although by entering the country , in my opinion, Russia turned to the enemy of England and France as well.
Indeed weird!
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