It was whole year later then "Ukrainian meddling" that got Putin that approval rating...
There was freaking million march of opposition year before this minor rally, way stronger. Noone was killed before that one, they marched just fine, and it didn't change anything. This rally wouldn't change anything either, Nemtsov or not.
Opposition got another "martyr" to pin on Putin and rally Western support (which seems to be their general aim, not actual "regime change").Seems like he got what he wanted, while any opposition got nothing.