The nature of cyberwarfare is that it be untraceable.
Add to that the ability to clearly prove it.
Add to that that if you could prove it, it presumes the charged are going to be impacted by it or alter their cyber warfare strategies.
Hands up who sees Russia or Israel or China doing that?
Why only Russia, Israel (who seem to have admitted it) and China on your list? Why not the US or even the UK? The French aren't just a benign former colonial power either you know.

