Sarmat was not the one I saw discussed. I saw it was a variation of Topol. It has different names according to its payload. With a Nuclear payload, it could be ICBM, conventional is heavier so it travels less.
This one is named "Oreshnik" and is supposedly derived from a predecessor RS-26 "Rubezh" IRBM. You appear to be correct about range tinkering by adjusting warhead weight, which is what was demonstrated with the RS-26.
I've read the important thing about this launch was the MIRV , the multiple warheads
It's a new missile, not the Sarmat. I haven't read that it has multiple warheads, nor that multiple warheads struck a target.
Sarmat was not the one I saw discussed. I saw it was a variation of Topol. It has different names according to its payload. With a Nuclear payload, it could be ICBM, conventional is heavier so it travels less.
This one is named "Oreshnik" and is supposedly derived from a predecessor RS-26 "Rubezh" IRBM. You appear to be correct about range tinkering by adjusting warhead weight, which is what was demonstrated with the RS-26.