The U.S. suggested Thursday it has limited ability to shoot a North Korean missile out of the sky and spurned suggestions of a pre-emptive strike on the ground. Still, it warned the Koreans would pay a cost for a missile launch. The nation’s missile defense system, which now includes about a dozen interceptor missiles in Alaska and California and on some Navy ships, has suffered multiple test failures since President Bush ordered the Reagan-era program accelerated in early 2001. Full Story