Rising tensions between the US and North Korea is sending ripples of concern around the world, and has the military on high alert in Guam, after North Korean leader Kim Jung Un threatened to launch a missile attack against the US-controlled island.

Don Hellman, professor emeritus at the University of Washington's Jackson School of International Studies and longtime North Korea expert, joined us to help make sense of what's going on, and how to assess the impact of these tensions on the West Coast,