Hi Smokanabeach -
when you come from French silver collecting as you stated - than the step to Russian silver is easy. You already know all about quality, marking, where and how to look , different time periods etc.
You just need some good books about Russian silver.
My suggestions:
No 1, the best but hard to get:
M.M. Postnicova-Loseva, only in Russian language
No 2, very informative, in different languages:
Alexander von Solodkoff
No 3, better than nothing, just a copy of a copy, but in English language:
Geoffrey Watts
Try Amazon etc.
Regards
Zolotnik