Opinions vary widely among North Korea watchers . That is the fundamental reason , '' said Young Howard , who heads the NGO Open Radio for North Korea , which maintains a network of contacts north of the two Koreas ' demilitarized zone . Theories include a show of strength and a miscalculated reaction to an apparent threat . Comment: Yet another theory : Pyongyang needs constant military tension to unite its people .
Opinions vary widely among North Korea watchers . Theories include a show of strength and a miscalculated reaction to an apparent threat . Comment: Yet another theory : Pyongyang needs constant military tension to unite its people .