IRT SpeakUp, when North Korea fires its first rocket towards Guam over Japan's airspace, it is an act of war.  The United States and China must shoot down that 1st rocket over International waters before reaching Japan's airspace.  The next action will be for China to cut off all exports and support to North Korea with the support from the United States, South Korea and Japan.  The ban of support and supplies to North Korea does not end until North Korea remove its current leaders, period.