I'm not sure why God has put North Korea on my heart lately, but he has. It started with references to the Christians there, coming out of hiding in 1950, when US forces marched north toward the Yalu River. When we were pushed back late that year, these believers were forced back into hiding. Who knows how many suffered and died under the hands of their oppressors, some 'ratted out' by their neighbors in order to gain favor with the communist authorities.
Richard Land has written a good article on the problem here-
It doesn't cover all the details, but gives a good introduction to the problem. Please pray for the liberation of these people, many of whom are Christian, and all of whom are suffering and need the gospel proclaimed openly in their land.