Moscow must be too far South to see it. Almost all the regular users of this site are in Moscow.
You need to be close-ish to the Arctic circle to see it regularly. Murmansk would probably be a good spot, in Russia - or Magadan. We get them in Sweden too, but not normally in Stockholm.


Edit: Found this on youtube. Green is the "regular" colour. It's a bit more unusual and cooler with purple.