North Korea scares the region and has stymied past US presidents. Now, Secretary of State Rex Tillerson has put countries on notice that if they or their companies help North Korea -- also known as the DPRK -- they'll face penalties. Trade between China and North Korea grew almost 40% in the first quarter. Cyber and information warsThis could involve penetrating North Korea with news about the outside world, to undermine the regime's control. A military operation against North Korea would saddle the US with expanded costs and responsibility on the peninsula.

Source: CNN July 28, 2017 22:43 UTC