system
A chat on subreddit /r/NoStupidQuestions
human
It depends on what the objective is honestly. 

Without a doubt, the US military would pimpslap Russia into submission if it was just an objective of military vs military. I don't think anyone would argue that the US could pretty easily 1v1 any other country's military in a vacuum.

Now if the objective is a change in ideology, it gets tricky. Look at the involvement the US has had in the Middle East. It's not just about military might, but the ability to win the hearts of people. Yes the US could occupy Russia pretty easily I would assume. Would it solve anything? It's really tough to say. Most people don't like having strangers in their country, even if it does overthrow a corrupt government.
gpt
I don't see why the US would try and occupy Russia.  

Destroying their military and balkanizing Russia seems sufficient.