The Russians have done this before
http://en.wikipedia.org/wiki/2007_cyberattacks_on_Estonia
http://en.wikipedia.org/wiki/Cyberattacks_during_the_2008_South_Ossetia_war
Wonder if this is the deal that Omama gave the Russians for pulling our interceptors out of Czech Republic?
And the Russians had it done to them at least once before:
http://en.wikipedia.org/wiki/Siberian_pipeline_sabotage