Former Soviet republic Estonia has been under constant cyber-attack since it removed a Russian statue a month ago. Estonia claims that the attacks are from the Russian government. Journalists love the story and have been blindly repeating it, such as John Markoff reporting: "In Estonia, what may be the first war in cyberspace.
Like the attacks against Estonia, these attacks in cyberspace coincided with physical protests in the streets. Russia has an unusually large hacking underground with many people controlling large botnets. Any issue that brings Russian protests to the streets is therefore almost certain to bring with it DoS attacks. Thus, using Occam's Razor, it's unreasonable to believe that the Russian government itself had any direct influence on the cyber-attacks.
This story reflects the general paranoia of the Internet. Whenever anything happens, people seek to uncover the "plan" behind it. In reality, most bad things that happen on the Internet occur by happenstance, without any plan or conspiracy behind them.
An example of this is the Slammer worm of 2003. It hit South Korea especially hard. This is likely due to the fact that South Korea had unusually high bandwidth, and an unusually high percentage of vulnerable servers. There is absolutely no evidence that they were targeted by the worm, yet many in South Korea still believe the worm targeted them. Another example is the Witty worm of 2004. It hit the US military hard. This was due to the fact that the military controls the largest block of the world's IP address space and monitored it with vulnerable promiscuous systems. There is no evidence that they were targeted by the worm, but most people believed that the Army was the target.
Unfortunately, "happenstance" is not a legitimate story angle that reporters can report on. It's always something like "is this cyberterrorism" or "is this cyberwarfare".
EDIT: I just noticed this story on Slashdot, where the awesome guys at Arbor describe their analysis. They point out a few other examples, such as cyberattacks from Korea protesting a decision by an Olympic judge against a Korean athlete. Another example was a nationalistic cyberattacks traded between Packistan and India. Again, these incidents show evidence of popular protest rather than government directed cyberwarfare.
EDIT: Here's a link from Ars Technica that refuses to give up on the cyberwar theory.