Such a weapon would be a fraction of the cost of a ballistic weapon and yet pose a real challenge to intercept most f the time flying at mach 8 to 12 depending on where you try to intercept it.
For instance you could launch a missile at London and have the four or five small nukes released over other countries on the way to the target... just to spread the damage.
Such intermediate range cruise missiles are not restricted by treaty or agreement and while the west is agreement incapable then it makes sense to have the capacity.
It would also mean long range and sub launched missiles can be concentrated on targets further afield like the US.
Thunderbird, with its unlimited flight range and low flight profile will also be useful against very long range targets and Poseidon would also have global reach too.
The difference would be that if needed Russia could launch a hypersonic scramjet powered 5,000km range missile to hit a target in the west with a conventional HE warhead and not necessarily start a nuclear war.
Maybe obliterating the Eiffel Tower could be the message the west needs to hear.
The Germans talked about taking down the Crimean bridge, but the Germans really don't have an equivalent target worth hitting...