Yeah under-age night clubs are hardly a new concept, and those girls are wearing more than they would be if they were at the beach. Dancing in a bra is wrong but swimming in a skin-tight bikini isn't? I won't pretend I'm entirely comfortable with the concept, but as long as it's properly supervised, it's probably no worse than what they'd get up to being at a park or in a house where the parents are away for the weekend, and certainly not something you can hold up as an example of Russia being culturally degenerate or whatever. There are plenty of underage dance parties here, maybe the age bracket is a year or so higher, but they're still full of 14 - 16 y/o's off their head on dirty "ecstasy" or vodka they snuck in, hooking up in the corners.