Hi,

I'm not even sure there is a Russian restaurant in Munich. I only know a russian bar Salon Irkutsk https://www.salonirkutsk.com/ which is okay. About greek restaurants. The greek restaurants in Germany tend to have a very hearty homestyle cuisine. I'm not aware if any real good greek restaurant downtown Munich. The ones that are better are in the suburbs where the rent is cheaper and normally only the locals know them better.

About Bavarian cuisine:
Georgenhof https://www.georgenhof-muenchen.de/en
Gasthaus Weinbauer Gasthaus Weinbauer
Beim Sedlmayr, Westenriederstr. 14 near Viktualienmarkt (do not come too late in the evening (after 8pm) since they use fresh ingredients (almost nothing frozen) and as later it gets they run out of the fresh stuff)