Sorry, it's not Soviet, Cyrillic alphabet does not have a letter "Z".. your best bet is posting this on IDCC mailing list to see maybe someone knows anything about it..
When I've started searching for this camera I also thought at this possibility. Unfortunately hadn't much luck with that either, "Mono" being a very generic word especially in photography. But I will start looking for it again more thoroughly, thank you for reminding me of that.