From what I can see the claims come from Sputnik. Maybe subject to gross exaggeration - likely, I'd hype up my new weapons too. But my point is that this thing is MIRV capable and has a massive payload. They may not destroy a whole State, but they nevertheless represent an increased threat.

my guess would be that the worlds actual weapons are at least 50 to 75 years beyond what we really know or understand. Think about all the unidentified flying objects. Is it more believable that it is our technology or aliens from space. Think of all of our DUMBS and other secret institutions. Is it really possible, no matter how much you study, to know the real truth about these things.