PC World has the article Why Russian hackers, not a lone wolf, were likely behind the DNC breach. Here is the “proof” I have been waiting for.

The breach began as far back as last summer and involved malware previously used by two hacking groups known as Cozy Bear and Fancy Bear.

Both are thought to be based in Russia and considered among the best hacking teams in the world, said Michael Buratowski, a senior vice president with Fidelis Cybersecurity, which was called in to examine the malware in the DNC attack.

Wow, this really does it for me “thought to be based in Russia”. Is that definitive or what?

Do I really have to put in the <sarcasm></sarcasm> flags, or can you figure this out for yourselves?

To be sure, there is more in the article than what I emphasized. You can read it yourself to see if you think it is convincing enough to go to war over.

To dig shallower, you can refer to the Info World article Politics bog down US response to election hacks. This article was what led me to the PC World article.