North Korea shows no signs of stopping or even slowing down its attempts to achieve an effective nuclear deterrent. And neither will it cease test-firing projectiles on a ballistic trajectory over Japan. In late August, Pyongyang penetrated Japanese airspace for the first time in some years, a move that sparked international condemnation. With its follow-up test early on Sept. 15, North Korea launched another ballistic missile over Japan's northern island of Hokkaido. The projectile travelled the equivalent distance from Los Angeles to Washington DC before dropping into the northern Pacific Ocean. The launch site -- near Pyongyang International Airport in the city's Sunan district -- was the same as the Aug. 29 test....