He also wants the Ukrainians and Poles to fight each other, like they did during WWII. Divide and Conquer.
By the time this is over, NATO itself may be in trouble.
We will be tangled up for years in conflicts as in the Cold War (proxy conflicts), paying out the @ss to float not only Ukraine but other allies, and our economy isn't in the best condition despite our controlled media and polit beuro narrative.
When we decided to screw with the Russians, we picked a fight with someone weaker than us, but far more capable than any of these diaper heads we have been pushing around for the last 33 years.
Russia can push back and I am afraid that what you're seeing now in Iraq, Syria with the Houtis is only the beginning. We are spread out over the world. We are spread thin and it's hard for us to mass power in one one place because of our commitments around the world and with parasites like North Korea which always become active when we are committed somewhere. Targeting us isn't hard. We're NOT loved everywhere and there are many that want to do us harm. All the Russians have to do is choose the one they think they can trust, is most cable and arm/train them: https://en.wikipedia.org/wiki/Private_militias_in_Iraq
Do not be suprised when eventually you hear about a US helicopter being brought down by one of these: https://en.wikipedia.org/wiki/9K333_Verba
What you're seeing now in Iraq and Syria and the casualties we are taking there (downplayed because a Democrat is in office), is just the beginning. This war will eventually come home to us. And when it does, realize we opened that door, we asked for this: https://www.reuters.com/world/europe/ukrainian-president-zelenskiy-holding-talks-with-biden-adviser-says-2021-12-09/
As to how far Russia will expand West. That is actually simple to answer: look at a true ethnic breakdown of the areas of Ukraine (most the stuff you find now is revisionist Ukrainian junk, use pre war info): https://commons.wikimedia.org/wiki/File:Ethnolingusitic_map_of_ukraine.png Look at those areas that are significant Russian speaking with the exception north of the Crimea and heading towards Odessa. If I were the Russians, I would want to tie into Transnistria: https://en.wikipedia.org/wiki/Transnistria Bonus, this would land-lock Ukraine. Russia has zero interest in taking areas that are nationalist. They do not want to get tangled up in a conflict where for the next 35 years they are dealing with an insurgent partisan / guerrilla type conflict.