North Korean plane bomber in rare interview with BBC
22 April 2013 Last updated at 14:11 BST
After weeks of tensions on the Korean peninsula, and North Korea moving two short-range missile launchers to its east coast this weekend, analysts are wondering what the North is really up to.
It is not easy to get an insight in to how the regime works.
But one person with first hand experience is Kim Hyun-hui, a former North Korean agent, who blew up a Korean Airlines plane in 1987.
Now pardoned, she lives in seclusion in Seoul where she has given a rare interview to the BBC's correspondent, Rupert Wingfield Hayes.