https://en.wikipedia.org/wiki/List_of_federal_subjects_of_Ru... (the data is copied from https://fedstat.ru/indicator/31517# - Federal Statistics service of Russia - but it's closed for access from outside).
1.42 is worse than in 20 out of 27 EU countries and worse than in EU overall (1.53). With much lower readings in Russian-populated regions, i.e. it hangs on Muslims. Of which Russia has more and they grow faster than in any EU country. Some almost purely Russian-population regions rival South Korea in low fertility with <1.0 readings. Probably fertility of Russians themselves is under 1.0 in all regions except Moscow.
Not sure why you are trying to find something good where it simply isn't.