Two points.
1. This will/is benefit/benefiting Russia.
2. Mach speeds are a misnomer. The speed of sound is lower at higher altitudes. A missile traveling at high altitudes can reach 16 mach much easier than when at lower altitudes. But it will be traveling slower than mach 16 at lower altitudes if it is using the mach 16 of higher altitudes. So, what is the altitude that the mach 16 is measured at?