CNN Situation Room With Wolf Blitzer August 20, 2015 22:03:00
How to col escalation. >> reporter: stress has been building for weeks. u.s. and south korean officials believe the north koreans started it all by planting land mines on the southern side of the dmz. an explosion august 4th nearly killed two south korean soldiers. south korea responded by resuming loud speaker broad casts toward north korean soldiers for the first time in a deck tade. messages telling them kim jong-un's doing a bad job and there's a better life in south korea. and this week a massive show of force by the u.s. and south korea. some thi some 30,000 u.s. troops, 50,000 south kor...