Sarmat doesn't offer much new in comparison with R-36.
Main difference is that it doesn't require any foreign (Ukrainian) components.
In fact, it offers many new features.
There are significant novelties between Sarmat and Voevoda. For starters, the launch weight is about 100 tons of difference between them, the Sarmat weighs 110 tons, the Voevoda weighs +200 tons.
The fundamental novelty of the fifth-generation Sarmat rocket and its difference from its predecessor lies in the use of orbital bombing technology. The flight path of a conventional ICBM is easy to track, and if you know the launch point in advance, you can roughly determine the area where building a layered missile defense system will begin.
The novelty of the FOBS employment with the future employment of the "Avangard" hypersonic complex will make the Sarmat a very difficult missile to be detected and intercepted by the current American ABM system because the Sarmat employs the depressed trajectory, allied to the Avangard hypersonic missile, the current system ABM is virtually nullified, the large American ABM radars will not locate and target interceptor missiles in the response time feasible for the entire American anti-missile complex.
The glider's flight speed and maneuverability solved one of the main tasks that have always been set for ballistic missile designers: thanks to new engines and hypersonic technologies, it was possible to shorten the acceleration section, that is, the time from launch until it reaches the necessary height of the separation of the combat blocks, this will improve the description of the rocket at the expense of the American space IR early warning system.
All the technical solutions together led to the fact that Sarmat, unlike Satan, needs much less time to destroy all targets - instead of twenty minutes, as Satan had, ten is enough for Sarmat.
The rocket can fly through the north and south poles, and work with head fairings made it possible (if necessary) to increase the number of warheads from 10 to 12, as well as increasing the range to 18,000 km, an expanded capacity over the R-36. which is +11,500 km/16,000 km.