I’ve seen the story all over the net about successful Russian test launch of the RSM-54, or Sineva from the Tula, Delta IV class submarine earlier this month.

There was much talk about it was a “hybrid ballistic missile that in its final stages becomes a modified cruise missile” is actually a bit of a misnomer.

…., is a hybrid ballistic missile that in its final stages becomes a modified cruise missile. In this guise, the warhead cannot be targeted by anti-missile systems that rely on a ballistic trajectory for their calculations.

This is a misnomer. What we have is called a “MARV”, MAneuverable Reentry Vehicle, and it is fairly old news.

The Pershing II which actually reached deployment in the 1980s in Europe before being retired under the INF treaty had such a system, though not for ABM evasion, they coupled it with a terminal radar for a CEP under 30 meters.

For a strategic system it would likely be used for evasion, and there are reports of it being used on the Trident reentry vehicles.

You can see see the aerodynamic surfaces, and the radome on this picture of a Pershing II launch from Wiki.