One catch with Russia -- officially, the prongs on Russian outlets are 4.0mm diameter vs. the 4.8mm standard in western Europe. The spacing (19mm) is the same.

This means that it's possible a western Europe plug won't fit because the prongs are too big. I had this problem in a friend's old Soviet-era apartment.

This is mitigated by the fact that some adapters do have the 4.0mm prongs, which work fine in western Europe outlets too, and newer outlets in Russia seem to be more forgiving of larger prongs. If all else fails, you can pick up an adapter in Russia fairly cheaply.