I was thinking about this line of reasoning and my opinion is this. I just don't think Russia is going to point blank turn around, leave Ukraine and lay down their arms. It's simply an unrealistic hope. So what are the alternatives? Fight! Well, that avenue of thought means war. And with the U.S. pulling back from that pathway, and with the desire to defeat Russia so strong, then there are a few things that will need to be sourced elsewhere. Billions of dollars, likely tens of billions, or even hundreds of billions, will be required. Armaments of all sorts, from drones, missiles, tanks, artillery, ammo, missiles, and a whole litany of supporting supplies and equipment, intelligence, and most tragic....men and women to commit to battle. All this for an extended period, likely years. In the event it would touch off a world war, then other factors, many very dire, arise.
The other avenue of thought is to come to the table and hammer out a deal for peace.