Let me first say that I'm overwhelmingly annoyed by all the "Cyber War" topic being Tweeted, blogged, and written about in the media. Please stop.
I had a very intelligent conversation a little while ago with Marcus Ranum at the ISSA Louisville Metro InfoSec Conference where him and I were both speakers - and much to my surprise we were on the same page regarding this whole "Cyber War" stupidity. War, by its very nature, is a destruction. The goal is to cause damage so that one group (presumably a nation-state) can take over another. This most often requires bloodshed, large amounts of resources, and most importantly - physical invasion. This is where the whole "Cyber War" silliness breaks down for anyone that understands anything.
The people I've seen and read spouting off about "Cyber War" and "Cyber Terrorism" and all that related cyber-whatever just don't get the main point. You can't take over another nation-state by "DDoS'ing" it off the face of the Internet. Cutting off my Internet, shutting down a power grid, or causing a possibly catastrophic event at the other end of an IP connection simply doesn't constitute a war. Now, if one nation-state were to openly attack the infrastructure of another, and cause, say, a nuclear meltdown killing millions - that could be an act of war ...but you'd have to make a stretch even to get that accepted.
You can't tell me that if tomorrow morning we woke up and there were billions of IP packets shooting off from Chinese Internet-space at our critical infrastructure components (wait, that's happening already isn't it?) we the United States of America would declare "Cyber War" ...and if you tried to tell me that I'd make a case to have you committed. In the virtual world, where packets buzz around, there are on bullets. There are no full-scale invasions. There isn't a displacement of cultural values by a military presence.
On a slightly different view - if Switzerland hired a bunch of hackers and completely took over the entire US Internet-connected presence - and I mean anything connected to an Ethernet cable - what would that mean? Would that mean that they then could "declare war on" the US and take over? I'd love to see them show up no our shores with their laptops and try... even if our defenses were crippled there is a sizable military presence here that would blow them to kingdom come once they were within reach of our shores. See my point?
So once again - "Cyber War" falls on its face as just a piece of hype that someone started and other clueless lemmings jumped on to make themselves look smart. Let me clarify for you - if you're talking about Cyber War as our biggest threat right now - you're an IDIOT.