In a recent appearance on Russia's state-run television, Russian political scientist Sergey Mikheyev suggested that the country's "empire" should grow to encompass three American states.
"I want the Russian empire with Alaska, Hawaii, California, Finland, and Poland," he said, as translated by Gerashchenko for the clip he shared. "Although Poland and Finland are so stinky, I'm not sure, to be honest. We'll clean them."
Russia doesn't have the naval, air, and amphibious forces required to do an invasion of the US to the point that they'd be fighting a land war in the first place. Doing that entails winning naval and air control adequate to move amphibious forces in.
This article is from a while back, but has a guy at Jane's assessing that the aggregate militaries of the world wouldn't be sufficient.
I don’t think most countries have invested in “projecting” power very far. I do agree there probably isn’t logistics enough anywhere to handle it. However, if you start with Mexico and build your armies over years, and somehow US doesn’t notice or doesn’t intervene, now you have a land war