system
A chat on subreddit /r/wallstreetbets
human
The west is wayyyy to invested and getting wayyyy too much military data for that to happen.

Worst case is a protracted stalemate where Ukraine can't fully reclaim lost territory and is forced to sign an armistice.
gpt
The limiting reagent is not the amount of weaponry Ukraine will have access to but the attrition of its fighting force from its general population.   Once you deplete the 18-60yr old male population, you can't just replace that inventory.   

This is where Russia can simply keep pouring shit down the tubes and count on someday, sometime, being able to clog that pipe.  

What the war requires is an internal rebellion within Russia to depose the current regime and replace it with one that will end the war.