Russian domesticated red fox are a domesticated form of the red fox (Vulpus vulpes), first domesticated in Siberia as an experiment conducted to see how domestication effects the physical morphology of animals.
But I've sort of wondered if these foxes would be a subspecies of red fox like dogs and cats are subspecies of gray wolves and wildcats respectively or whether they are simply a strand, a race or a breed of red fox. What do you think?