What threat do North Korea's missile and nuclear plans pose, and what forces might respond to conflict?
As missile tests become more frequent, how do South Korea, Japan and the US plan to stop an attack?
Kim Jong-un, the young leader driving North Korea's nuclear ambitions.
China is caught between a rock and a hard place in dealing with its troublesome neighbour.
Talks, pressure or troops - how should the international community deal with Pyongyang?