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The first known incidence of believably state-sponsored international cyberwarfare was in April 2007, when many Estonian organizations, including the parliament, banks, ministries, newspapers and broadcasters, saw their websites fall under a series of cyber attacks.
It originated as a political dispute over the relocation of the Bronze Soldier of Tallinn, an elaborate Soviet-era grave marker. Most Estonians considered the Bronze Soldier a symbol of Soviet occupation, while Russians regarded it as a symbol of Soviet liberation and victory over Nazi Germany. When the Government of Estonia started final preparations for the relocation of the statue, disagreement over the propriety of the action led to two nights of mass protests and riots (accompanied by looting). The cyber-attacks began on April 27, 2007, lasting three weeks; some observers reckoned that the onslaught on Estonia was of a sophistication not seen before. The case has been studied extensively by military planners in many countries.
Another instance of cyberwarfare being used was allegedly by the United States against Iran, wherein the US issued commands to the centrifuge in an Iranian nuclear reactor to spin at speeds which caused it to break. This was repeated with the final effect of destroying roughly one fifth of Iran's nuclear centrifuges. 
- SC Magaxine: Cyberspace and the changing nature of warfare
- The Guardian: Russia accused of unleashing cyberwar to disable Estonia
- A well known Russian hacker Sp0Raw believes that the most efficient online attacks on Estonia could not have been carried out without a blessing of the Russian authorities and that the hackers apparently acted under "recommendations" from parties in higher positions
- "We don't have directly visible info about sources so we can't confirm or deny that the attacks are coming from the Russian government," Jose Nazario, software and security engineer at Arbor Networks