So in essence the U.S. is at war with Russia with Ukraine fighting it for them.
Please, do not repeat Russian propaganda.
Wake me up when US jets engage the Russian airforce and air defence.
And when US Sixth Fleet starts sinking the Russian Black Sea Fleet.
Then we can talk about Russia fighting US.
Ukraine is out numbered 4 to 1.
If Russia mobilizes and it doesn't cause riots or Russian generals marching on Moscow, they'd win the war against Ukraine for sure. But that's a big IF, and clearly Putin doesn't want to ask that question.
Much like how the Ottoman sultan was reluctant to call a jihad, because he was afraid nobody will show up and his prestige will disintegrate, so is Putin reluctant to call for total war. This is exactly what Lenin was hoping to see, the crowned heads of Europe calling for war and the people not showing up to fight. Now the man sitting in Lenin's chair is afraid to see it.