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Down with president xi, he told me for about ten minutes about the history of north and south korea. i realize now that's a really serious issue. a complicated issue. so if both sides can seem to walk away with a victory, then yes this does seem to have been a good week for both presidents. >> general, what do you think about this? because when it came to say, syria, using chemical weapons, we saw president trump do not air strikes on syria. we have seen him go after isis in afghanistan or certainly his general there did. that's not the option he has with north korea. >> not at all, brianna. w...

Truthly concerns me. i spent time on the peninsula serving there. what i tell is you this is a high risk operation. there are an lot of courses of actions or options. you can't just react with an air strike because there are people involved and this is a strategy. it should be part after strategy as just -- opposed to just a tactical event. i'm very concerned about this because we do not have a strategy. we certainly have a war plan or campaign plan that we could apply in korea but it doesn't consider a preemtive strike or reactive strike with weapon systems that could result in a very irratio...

States military. so yes. >> the white house is attempting to frame this mission as one in a series of recent military successes. >> another successful event. >> but there have been challenges in the larger fight against isis. just this week, the u.s.-led coalition in syria killing 18 of its own allies from the syrian democratic forces. but u.s. central command said was actually requested by the syrian democratic forces who thought the target was an isis fighting position. >> sn. >> >> there's been more scrutiny. in the past month there are two other u.s.-led air strikes killing allies. one in ...

>> this was nicholson led. >> he's the theater commander. not using nuclear weapons or something that would require presidential approval, and it was the right weapon for this particular place where there were no civilians, a very remote area. i've been there. it did -- it did the job. >> i think because of the name and just because of the size of this ordnance there's an expectation that it's really sending a message. is it? is it supposed to be sending a psychological message or is this really just the type of weapon that you use when our going after isis tunnels in. >> we've used this we 15...

Weapon was simply the appropriate tactical moment against the proper target to use this particular munition, so it is not related to any outside events. >> reporter: it does deliver a psychological message to isis, one military official tells cnn the massive bomb is powerful enough to destroy nine city blocks. >> a diameter of 15 to 20 soccer fields, football fields. it will level that area and provide an unbelievable amount of concussion to that area, so it will collapse caves. it will blow up things, and it will -- if you're alive afterwards you're going to have perforated ear drums and a lo...