You are not entirely wrong. Except that Russia has no interest in territorial acquisition for its own sake. They will stop somewhere short of the Polish border, I reckon.

I explain more in this article:

This is How Ukraine Ends

I have broken down this article into the following chapters:

1. The West is running away
2. Where do we go from here?
3. What will Europe look like after the war?
4. A gift to Poland?
5. What Russia wants
6. Towards “A New European Security Framework”
7. Why the West will agree to Russia’s demands
8. How the deal gets done