Don't believe anyone is saying that, Article 5 stands, so incursion into Poland or Germany and NATO forces become involved. Unlikely that he has the military strength at this point to shift and move north to Finland or Sweden, estimates are that 50 to 60% of his ground forces are now in the south. The Swedish air force is not to be taken lightly. Also believe Putin is enough a student of history to know how disastrous a 2-front war can be.so we'll let him have Poland then too? How about Finland, Sweden? Germany? all he has to do is threaten to use nukes to get whatever he wants? better to just call his bluff now so fewer people get hurt. and if he nukes us it is something he is going to do anyway.
We are already hearing verifiable stories of Russian conscripts laying down arms, sabotaging their own equipment, running out of fuel and food (an army travels on its stomach), etc. Putin has greatly miscalculated his own strength and the resolve of both the Ukrainian people and the NATO alliance - hoping the realization is sinking in and he tries to find a way of claiming victory (ie, Ukraine has no been denazified, we can leave) and shutting this down - I would think we also need to provide carrots to nudge him in this direction (would not be surprised if this was happening in backchannels), not just sticks, but be ready to wack him and wack him hard should he try to expand this (also conveyed by the same back channels).

