SEOUL: Dynamiting inter-Korea roads and railways. Threatening war over drone incursions. Moving nuclear-capable weapons to the border. North Korea appears very unhappy with the South at the moment -- but why?

More than 1.4 million young people have volunteered to join or rejoin the North Korean army in response to alleged drone incursions by South Korea, state-run media claimed Wednesday.

SEOUL, South Korea -- In a symbolic display of anger, North Korea on Tuesday blew up the northern sections of unused road and rail routes that once linked it with South Korea, with the rivals exchanging threats days after the North claimed that the South flew drones over its capital Pyongyang.