When I look at North Korea, in answer to your question, does one look at it as a threat to North America or is it a threat to Europe? I'll focus on North America.
This is where NORAD steps in. NORAD has a mission of identifying any attack, and one of the tasks I had, and our current deputy commander out there has, is the integrated tactical warning and attack assessment. Within seconds anywhere on earth, somebody can pick up the launch of a missile, and within a certain period of time it must be assessed as to whether it's an attack or not. That's the first part of it. That's the attack part of it.
The second part of it, of course, is the ballistic missile defence for North America, which is in the hands of the U.S., and that's being dealt with. Of course, there is always the third portion of it, which is what retaliation would the U.S. take, which is strictly a sovereign decision by the United States.
I hope I have provided a little bit of an answer to this.