Either they're trying more of the Nixon mad-man theory out or they are as I've speculated preparing to move from the escalation of long-range strikes which cannot change the nature of the conflict to sending troops.
I speculate that they'll probably dip their toes in, e.g. they'll openly send some mercenaries or some small units to salami slice their way to sending a whole bunch of units by January (before Trump) or spring of next year to enforce the idea of freezing the conflict.
This is unacceptable to Russia and it should be. They've lost too many lives, spent too much capital in all senses of the word and should see the task finished not frozen so the west can rebuild Ukraine's armies for another go in 15 years and arm it to the teeth with missiles in the mean-time.
The people of the world and Russia cannot submit to their blackmail, we must remain unflinching in this game of chicken. I predict they will blink. But even if I knew they wouldn't I would still advocate against submission to their tyranny no matter the consequences.