I have heard from my friends in Kiev that they can now get Japanese food including Miso or soy-bean- paste used normally for daily soup.
Well, surely, in Russia also is Japanese cuisine popular to some extent because of its healthy image; however, it is not certain those Japanese restaurants are authentic or sort of pseudo- Japanese ones.
Anyhow, the most important point is that the price is still very expensive for the Japanese taste, which can be sort of obstacles to get reach to the restaurant!