I would be betting on a Russian lawyer appearing and demanding the case be immediately brought to court, with full evidence given to him. The prosecution will refuse that, and the judge will dump the indictments.
One odd factor here....if you were a true hacker, you’d take a lot of precautions. Tracking down and naming one single guy would be a great accomplishment....but to track down and name 12 guys? Either these are awful stupid GAU folks, or the whole thing is faked up.
And then you go back to the Russian election of 2011, and wonder....did the NSA folks attempt to hack into the Russian campaign server? Might the Russians have enough evidence to bring up charges as well?
Furthermore, tracking hackers without access to the hacked documents or equipment is, in a word, impossible.