Satellite imagery from Planet Labs shows apparent failure of the RS-28 Sarmat at Plesetsk
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Some sources reveal that the test was actually the use of a Sarmat with an Avangard hypersonic warhead, which does not have an explosive charge, but has a kinetic destructive power equivalent to 18 tons of TNT.
The Avangard is a hypersonic glide warhead that can be carried as a payload by the heavy ICBMs UR-100UTTKh, R-36M2 and, what interests us in this case, by the RS-28 Sarmat. There are certain "rumors" that Putin is not planning a nuclear response, if the use of long-range missiles is authorized for Ukraine, the idea would be to use this powerful warhead with an equivalent of 18 tons of TNT.
If this intention is real (something I considered some time ago but preferred to remain silent), this would be an order of magnitude worse than the use of the Kinzhal, which has a warhead with an equivalent of 1 ton of TNT in its conventional (kinetic) version.