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Takes some sort of overt action that south korea will respond. and i think president park is going to pick up where president lee left off. so that's the real danger here. it's an action that requires a reaction, and then you have a cycle of escalation that is very uncertain. >> former assistant secretary of state p.j. crowley. sir, thanks for being here. i appreciate it. >> all right, thomas. we move on now to south africa for the very latest on nelson mandela's condition. the former south african president is in the hospital with a lung infection. nbc's keir simmons is joining us from joha...

A miscalculation by the north, and that would force the newly elected south korean leader, its first woman president, to retaliate. experts say she has very little flexibility, and that would instantly bring the united states into this conflict. so that's why you saw the u.s. try to scare, or deter north korea, i should say, by sending those b-2 stealth bombers in their first nonstop round trip practice run this week from the united states. it's a signal to north korea, and also very strong signal to our allies in the region to south korea and japan that you don't have to try to seek nuclear w...

Whole lot is known about kim jong-un. he is a young man. the united states was hoping when he took over in december of 2011 that he would help to lead north korea out of its current state of isolationism. that is not what's happening. in fact, it's quite the opposite. >> kristen welker reporting live from the white house. joining the conversation now is p.j. crowley, former assistant secretary of state. sir, it is great to have you here. as you're hearing the reporting this morning from our kristen will kerr there at the white house earlier in the hour, we had a report from andrea mitchell t...