Why does Russian not have any major dialects?
Russian dialects and accents
The two main differences I have observed in Russian pronunciation are the ‘e’ and ‘o’ sounds on the unstressed ‘o’ letters. In Northern European Russia the ‘o’ tended to pronounced clearly (IPA: /o/) while in the rest of the country an unstressed ‘o’ is pronounced as an ‘a’ or an unstressed ‘e’ in English (IPA: /ɐ~ə/).
Possible explanations for such linguistic homogeneity
*Featured image courtesy of Giammetti Foundation