If it were a Ukrainian guy who did this I think it would be much less controversial. It’s good and proper for people being invaded to fight back with whatever means are available to them, but it’s a problem if we end up in a place where major conflicts have to escalate into global cyber war.

(I should mention that Russia already does tolerate destructive hacking against the West, and has been doing so for a while - that doesn’t change my opinion, but it would be unfair not to note.)