Tools can be stolen. In fact, if we're claiming whoever did this was a super-genius, they would have stolen or spoofed the tools they used to point at someone else. Unless they were Russia being so clever they were pretending to be someone pretending to be Russia!

Edit: Your link show Kaspersky labs making the claim that this was the FSB. Yet the West also claims Kaspersky is controlled by FSB! Well, you could say "they should know". Or maybe they want to humor the West so their ban will be lifted. Or maybe they aren't controlled by the FSB at all. But if the West can't figure that out, how do they expect to figure out the true origin of the hack.

"A riddle wrapped in mystery, inside an enigma"