Why imagine?
The 2007 attacks on Estonia [1] and the cyberattacks before the actual attacks on South Ossetia [2] are generally believed to be a Russian test of its capabilities.
[1] https://en.wikipedia.org/wiki/2007_cyberattacks_on_Estonia
[2] https://en.wikipedia.org/wiki/Cyberattacks_during_the_2008_S...