Russia cyberwar with Estonia?

This is worrying because I suspect it is a kind of warm-up, 'proof of concept' thing, and as one commentator said, "it would be difficult to prove the Russian state's responsibility, and that the Kremlin could inflict much more serious cyber-damage if it chose to."
The more serious things would be disprupting IT controls relating to communications, water, power ... just think if orders can't be made for food, or your power is arbitrarily off and on ... This is the shape of things to come, I fear.
PS. This Wired interview-article has helpful perspectives germane to the whole cyber war thing.
Russia accused of unleashing cyberwar to disable Estonia | Russia | Guardian Unlimited: