Good grief. Take off the tinfoil hat for a minute and actually think. Yes...Russia is a tough nut. But they do with "quantity" what we do with "quality". Going back to WW2.
Do you really think they have a Mach 9 missile that can hit the US in 5 minutes? Hello? Chernobyl? Kursk? K219? K129? And those are just the ones we know of. "Russia" and "Advanced Technology" are not two words that go well together.
Here's another term for you, and one that seems to have been forgotten since the end of the Cold War. MAD. Mutual Assured Destruction. The U.S. Nuclear "Triad", consisting of land based, air based, and submarine based nuclear missiles, is designed, constructed, and deployed in such a manner as to assure any potential aggressor, including Russia...that no matter what they do in a First Strike scenario...we can, and will, wipe them off the face of the planet. Putin is no fool. He won't start a war, and he is always looking for an edge, but the fact of the matter is that he has killed more Russians with his efforts in the past two decades than he would care to admit. This is why, as an AR-15 owner, I get a kick out of those who swear by Russian steel-cased ammo because it's cheap. Well, no s**t. When my life might depend on it, I'll take Federal barrier-blind at a buck a round over Wolf FMJ's at a quarter a round. I might only get one shot. It needs to count. Keep your T-72; I'll take the Abrams.
The only thing Russia has that can hit the U.S. in 5 minutes is robocalls and internet viruses. Those are real threats, and where we need to be looking. Or you can go buy up all of the aluminum foil that Sam's Club has, and worry about a missile that does not exist. Or work. Or both.