Mach 20 is really fast.
The fastest thing I’ve ever worked on was a surface to air missile that would do Mach 10. At mach 10 the steel guidance surfaces (fins) would heat up from air friction and melt off before it got to its target. We fixed it with a leading edge ablation material that would turn to a gas and protect the rest of the fin. Mach 20 is a whole new set of problems.
The ruskees know aerodynamics. They also know how to steal computer items. I suspect they are not blowing smoke.