Hello and welcome to the forum.
Where are your hamsters from? Did they come with pedigrees?
"Russian" is usually used to describe hybrids (a mix of Campbell and Winter White hamster species), and these are common in pet shops. If they came from a pet shop or did not come with pedigrees then I would not recommend breeding from them. Hybrid hamsters not a naturally occurring mix of species and are prone to neurological and behavioural problems and diabetes.
If you're in the UK, California, Sweden or Finland and you are interested in breeding Campbells/winter whites then I would recommend contacting your local hamster club, attending a hamster show and speaking to exhibitors to find pure Campbells or winter whites to start with