It is probably not an ideal situation.
I have heard of such pairings (Russian and Roborovski together) and thankfully as both have different genetic makeup including a different number of chromosomes each hybridisation is not an issue.
Ultimately they would never meet in the wild and certainly never cohabitate therefore I would not see much point in forcing them to in captivity, and I am sure one would probably be veryn scared of the other - both are quite territorial species who rely heavily on scent marking, especially the males of the species'.
I wouldn't put any money on the Russian surviving as Roborovski can be pretty violent, despite their diminutive size.
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