[yub]

But the definition of "cyberwarfare" is unclear.

If Russia declared war on the US, and attacked US companies, it's pretty clear this is cyberwarfare.

If Anonymous DDoS's your website of some vendetta, because they declared "war" on your company, is that cyberwarfare? Does a declaration of war by a non-nation-state count as cyberwarfare?

If North Korea compromised your servers to mine Bitcoin, is that cyberwarfare? Does any action by a nation-state count as cyberwarfare?