Science says hypersonics won’t live up to their billing.
https://scienceandglobalsecurity.org/archive/sgs28tracy.pdf
For starters, being hypersonic works at crossed purposes with being undetectable because air friction will super-heat the skin, producing a YUGE infrared signature and making it more easily detectable than slow-poke supersonics. Not to mention being hypersonic requires thin air (= high altitude).
The Godless Russians spent themselves into bankruptcy trying to match America’s Star Wars program (which never really existed). This could be more of the same in reverse. “Let’s goad the Yanks into building an unworkable and hyper-expensive weapons system.”
We’ll have to see one used in anger to determine which side knows what they’re talking about.
If hypersonics require thin air, high altitude, then why would air friction exist.
What is high elevation to you, 400 feet? Are you aware that Dnipro sits at 500 feet above sea level and the MRIV warheads and their submunitions hit Dnipro at Mach 10? Furthermore the MRIV warheads separated at a high altitude and guided themselves in?
Hopium is a helluva drug.