Perhaps this is a foolish thought, but I wonder...what would the outcome be if we could smuggle into Ukraine the supplies to set up a smallish number of ICBMs and launchers. Then notify the Russians that the guy that they're pointing a gun at also happens to have a gun pointed at them. It would be nowhere near the size of the Russian arsenal, but enough to potentially decapitate Russia. Game theorists, what is the most likely outcome?
I'm sure our military knows, but the idea is that it doesn't matter what it destroyed. What matters is that a volley of MIRVs seems to have been delivered in Ukraine. Honestly though, this is just another weak move from Putin. He's a an absolute clown who's foolishly taken his neighbor's house hostage, is surrounded by police and is now waving his gun in the air, repeatedly screaming "I'm gonna do it!". That's where we are. His chances of coming out of this unscathed are now zero. It's just how he's going to go out that we have to figure out.
If we're being completely honest here, neither you, I, nor the guy you replied to has any idea what missile defenses we have. They would be among the most secret of programs because they only work if your enemy doesn't actively work to evade them.