North Korea's Nuclear Threat: America's West Coast Defenses The pentagon suddenly strengthening the country's west coast defensive against a possible nuclear attack by north korea. Reena ninan has the story from washington. The big question so many wondering, why now? This is all part of getting you want to see how this country is progressing, in the past it's taken years between these long-range missile 'tises. In the past year alone it's only a matter of months between the tests. Keep in mind the new leader of north korea is young, 29 years old and, bianna, he wants to show he's continuing to consolidate military power. He clearly does and obvious that the administration used this as a serious threat. What else were they looking to do. Reporter: They are looking to put an additional radar in japan to give them an early warning detection system but the focus on these missile interceptors looking to increase by 50% and it'll come with a $1 billion price tag, bianna. We certainly have seen an increase in provocations have that young leader. Just scary story. A look at other major