My thoughts as well.....I tend to think those little islands will not survive for long.....although the soldiers are apparently given a 15 minute warning to run into their caves to sit out any bombing.....they are given just a limited amount of ammo for their rifles...and trained once that’s gone to do hand to hand combat with any invader.
They know they cannot wain against any invader but are taught to fight to that of sacrificing their life....thus their “front line” of defense is marked for death from the get go.
hell, just make announcements of $100 McDonalds gift certificates and a bed in South Korea to any who defect. It would be funny to take them over without a shot being fired.