Slashdot is getting ADD.
Go, read entire series of Snowden's twits on the subject. The whole point is: this disclosure is a warning shot. Imagine if the rest of the files will reveal targets, personally identifiable info on perpetrators, provable attribution etc. God forbid malware targets are in NATO countries or some such. This thing might explode into a serious international scandal.
Russians are mentioned simply because they might have better motives for pulling this off (with some tit-for-tat hacking going on right now). But that's beside the point.