Unlimited range and endurance, a problem for air breathing or rocket powered cruise missiles. The ingress route could be insanely convoluted to evade detection and tracking.
Fire it from Siberia and route it to come up from Mexico? The Russian deployment strategy would be fascinating to know.
the US researched this in the 40’s and 50’s
https://en.wikipedia.org/wiki/Aircraft_Nuclear_Propulsion
dang russians are using wikipedia to steal our secrets..