[waitwait]

Another angle I haven't heard is that they are just having a bit of fun for the lulz: They know their adversaries can (fabricate) attribute with or without obfuscation (cyber war signalling style). So they bring it over the top with some cold war 80s action movie dialogue. It serves no other function than to taunt and confuse and hear some American housewives on Twitter go: I dunno, sounds Russian to me!

[mootothemax]

By halfway through I was kinda surprised they weren't going the full hog and throwing in a good Da, or Nyet, the people's... for full effect.

[waitwait]

The full effect seems to be a thread of 200+ comments talking about the language in the release, sentence-for-sentence, and many (un)witting agents pouring over the contents of the files.

Perhaps, besides the fun of imagining someone having to explain to McCain what a "double dutch rudder" is, the language serves a higher purpose of increasing virality and impact.