Yes, it would be clear if you define "Russian". Do you mean everyone who currently holds a Russian passport? Everyone who has at some point held a Russian passport? What about someone who used to have a Soviet passport with their nationality recorded in it as "Russian" but who didn't live in Russia? What about people who used to have a Soviet passport and lived in Russia but with a different nationality in their documents?
(Apparently Russian passports up until around 1997 had a "nationality" field, like the old Soviet passports, so you could have a Russian passport with your nationality recorded as something other than Russian. Presumably you could officially be a Ukrainian citizen of Russia, for example. It wouldn't surprise me if some of the other former Soviet states also record nationality so you might be able to have a passport from Kazakhstan or Latvia that says "Russian" in it. I would hope, however, that nobody is seriously thinking of banning "Russians" while defining "Russians" to include people who have never had either a Soviet or a Russian passport.)
EDIT: I would guess that you'd probably want to define "Russian" for these purposes as someone who currently has a Russian passport, but perhaps it's not totally obvious that that's the right answer?