Depends on who wrote the rules and who wins. Its not like NATO/5eyes hasnt been going on about cyber warfare threats for at least 15-20years now, at least I've been aware of it for 17years.

I learnt during the Falkland conflict when the General Belgrano was sunk, some countries like the UK will ignore rules when it threatens them. https://en.wikipedia.org/wiki/ARA_General_Belgrano#Later_pol...

Churchill is another UK leader who chose to ignore rules or international agreements and I'm well aware criminals dont care about rules either.

This is just the Fog of War that is not a War.