Rules of Engagement In a New War. What Will This “Red Line” Be?

There's been a lot of talk lately in the news about red lines.

There's a red line for Iran obtaining a nuclear weapon and a red line for Syria.

Just yesterday we learned of a cyber attack on banks and TV broadcast outlets in South Korea. Initially, blame was placed on North Korea, but today we're learning the internet address may have originated out of China.

The fact that hackers try to throw investigators off their trail by manipulating internet addresses is fairly common. It's also fairly well known both China and North Korea actively train hackers, and then there's the group Anonymous, and more. Cyber warriors are running rampant and virtually any system operated by computers is vulnerable to attack.

So what are we supposed to do to protect ourselves as a nation from the threat? What happens when a cyber attack actually causes physical harm?

NATO has just released its suggested rules of engagement for cyber warfare.

For me there's still a question that remains unanswered. What's the red line in this new war?