Just a few musings:

• if a country launches a cyber-attack on another country is it considered a declaration of war? A cyber-attack could arguably have more damage than conventional weapons: it could take electricity and security systems offline which could endanger lives.
• Is a country attacked by electronic means allowed to respond using conventional bombs?
• Given the amount of danger a cyber-attack could cause, should it be added to the list of prohibited weapons which currently include biological, chemical and nuclear weapons?