This has been seen as an aggressive move in Russia and the current thinking inside the Kremlin is to go back to MAD with a credible deterrent and credible defence.
Whether it is technically feasible or not is one thing, the bigger picture is what those clowns in NATO are doing and how that the world situation is pretty bad re: aggression towards Russia, a country we need in Europe for things like oil/gas and security. It is the sanity of our leaders and not the technical ability of their engineers that we should be questioning.