I guess that dissolution of the SU influenced that fact widely.
That had a huge impact on deployment and production but did not have much of an effect on development to be honest.
Actually I think things like the Ukraine stopping making helicopter and ship engines for Russian platforms is a blessing in disguise... they haven't always done a great job... the Sovremmeny class ships were very much hit and miss with their propulsion systems and many had real problems.
Recreating production in Russia of these sorts of things is expensive and time consuming but they aren't building new factories designed and built in the 1970s... these are new state of the art facilities with modern production tooling and control and design equipment so even just with the same designs they can improve performance with better precision in production and the use of more modern materials that do a better job to increase performance... and now they make it themselves they can export it to customers who still prefer Soviet weapons an renew old trade links.
I read those are actually quite effective and less draggy than it would seem at high supersonic speeds, but of course at transonic speeds the lattice chokes and creates huge drag.
The grid fins present an enormous surface area that can retain effect at angles where a conventional fin has stalled and is creating drag.
If the missile is flying at subsonic speeds then there is a problem because such tiny control surface and strakes there is no way it will have the speed and energy to out turn a plane.
Interestingly, one of the main reasons for its employment may be something as apparently unimportant as the size of the actuators needed, since the moments created at the missile's body as smaller than in normal aerodynamic surfaces.
They said when they revealed them that it offered the ability to apply a turning force while turned at much higher angles of attack than a conventional control surface.
Would also add that a few ballistic rockets including Tochka use such grid fins.
The idea that the grid fins choke on subsonic air is rather unlikely because the US mother of all bombs uses grid fin tail surfaces... it is just a good compact way of getting a powerful turning force control system that needs an enormous angle of attack before it stalls and fails to provide control.
The other issue would be RCS, but it is an active homing missile so there is little point in being stealthy.