This is not true. In 2020-2021 curriculum year in Ukraine there were 874 schools that that had languages of minorities as a language of instruction.
In 9 different languages - Russian, Bulgarian, Crimean Tatar language, German, Polish, Slovak, Hungarian, Romanian, Moldavian.
Source, official website of Ministry of Education of Ukraine. (in Ukrainian) https://nus.org.ua/news/mon-pidrahuvalo-skilky-shkil-navchay...
One fact which people forget: Ukraine decided to end support to minorities, as such there is no longer possible to study in native language. This type of nationalism should not be supported at all. Ukraine is no saint.