There's a quote going on in some discussions in Russian. The quote itself is well-known and have about 100k hits if you sum different variations on Google.
Я всегда думал что демократия — это власть народа, но вот товарищ Рузвельт мне доходчиво объяснил, что демократия — это власть американского народа.
In English that will be:
I always thought that democracy is the rule of the people, but comrade Roosevelt here explained me to me in no uncertain terms that democracy is the rule of American people.
I can't find quote itself mentioned in printed materials and most people seem to agree it is later invention by a 3rd party, just like some other popular "Stalin quotes" like "no man, no problem".
So, did Stalin say anything like that?
And seeing how answer is likely, "no", maybe somebody can also identify a real author of this quote?