As U.S. President Donald Trump arrives in Asia, we look at the North Korean nuclear threat in our first Roughly Explained video.
Over the past few months, North Korea has steadily upped the ante with a series of provocative missile and nuclear tests aimed at demonstrating a capability to strike the United States. So, why is all this happening? Why is this tiny little country led by a dynasty of odd little men with hilarious haircuts and absurd suits so obsessed with nuclear missiles? Is North Korea just crazy or is there something more to it?