North Korea says its latest intercontinental ballistic missile test was meant to further bolster its “fatal” nuclear attack capability against its rivals. It's also threatening additional powerful steps over the upcoming drills between the U.S. and South Korea, which it views as an invasion rehearsal. The United States responded to Saturday's missile launch by flying long-range supersonic bombers for a joint exercise with South Korean warplanes. Analysts say the missile test signals Kim Jong Un is using the rivals' drills as chance to expand North Korea's nuclear arsenal. North Korea’s official news agency says the launch of the Hwasong-15 missile on Saturday was organized “suddenly” without prior notice at Kim’s direct order.