Generate text that refutes this claim: Cyber attacks are often carried out by non-state actors  Cyber attacks are often carried out by non-state actors, such as cyberterrorists or hacktivists (social activists who hack), without any involvement of the actual state. For instance, in 2007 a massive cyber attack launched on Estonia was blamed on Russia due to the then on-going tensions between these two states [17]. However, the attacks on Estonia were generated from all over the world; and even those from Russia could not have been linked to the Russian authorities, who denied involvement. Similarly, a huge wave of cyber attacks dubbed GhostNet that compromised computers in 103 countries in 2009 was blamed on China, not the least for hacking computers of Tibetan authorities. However, it could not be conclusively proven that this was an attack perpetrated by the Chinese authorities [18]. Any retaliation against a state for a cyber attack can never be certain to be against the right target – the state should not be blamed for the actions of its individual citizens.
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In case of non-state actors attack, many practitioners in international law agree that the state can still retaliate in self-defence if another state is 'unwilling or unable to take effective action' to deal with attacks coming from within their territory [19]. This applies to traditional warfare, but the same way it can apply to cyberwarfare. If a country is not doing anything, or not doing enough, in order to ensure cyber security and persecute cyber attackers, then the attacked country has a right to take measures against cyber attackers.