Russia Declares Cyberwar?

The Guardian reports on what some are suggesting may the first outbreak of official cyberwar between one country and another, after Russian hackers, official or not, have flooded Estonian websites with Denial of Service attacks (DDoS):

clipped from www.guardian.co.uk Without naming Russia, the Nato official said: "I won't point fingers. But these were not things done by a few individuals. "This clearly bore the hallmarks of something concerted. The Estonians are not alone with this problem. It really is a serious issue for the alliance as a whole."