The correct comparison is Spanish - I wonder what's the status of education in Spanish in thr US.
But more correct case in point is Belgium. If Belgium tried to force education to be in Dutch exclusively, there would very soon be no Belgium.
> allowing grades up to 4 to be taught in it,
"Banning grades after 4 from being taught in Russian" - I did it for you
All 30 years of Ukraine's independence they were seeing new limitations to the use of Russian, every year. Some of these are listed in comments.
Nobody has ever banned a language by allowing printing in it, allowing grades up to 4 to be taught in it, allowing secondary schools to teach it as a subject, and allowing private groups to continue teaching it as a primary language.