That was my first thought as well. On a slight tangent, I recently learned of the USA's Project Pluto.[0] A 1957 fusion engine which I believe is along the sa

That was my first thought as well. On a slight tangent, I recently learned of the USA's Project Pluto.[0] A 1957 fusion engine which I believe is along the same lines as the new Russian project. It was to power the SLAM.[1] [0] https://en.wikipedia.org/wiki/Project_Pluto https://en.wikipedia.org/wiki/Project_Pluto [1] https://en.wikipedia.org/wiki/Supersonic_Low_Altitude_Missile https://en.wikipedia.org/wiki/Supersonic_Low_Altitude_Missil... "The Big Stick with Pluto engine" https://www.youtube.com/watch?v=oVmpAD7WRxA https://www.youtube.com/watch?v=oVmpAD7WRxA