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They assemble it for a period of time before it is launched. north korea has moved on from sohae. they have moved on to solid fuel technology. those missiles can be rolled out quickly and launched from mobile launchers. that is what north korea has been doing in recent years. this is i am bis symbolic. this is one small step down a very long road to denuclearization. the big assets are still in place. >> will ripley for us in hong kong. thank you. the trump administration says 463 parents separated from toddlers at the border have been deported from the united states without their kids. the ...

Ago and they insisted back then the work was peaceful. >> what can you say to the world to prove that this is not a ballistic missile program in disguise? >> translator: why on earth would we drop nuclear bombs on the people of the world? including the united states. >> reporter: since then, they made many threats to drop nuclear bombs on the united states. one important point, the sohae launch site is a liquid facility. you can see from satellites. north korea has moved on to advanced solid fuel technology. you can move them on mobile launchers and launch them low level low level -- them with...

Launching used liquid fuel, that's time consuming, you roll the things out, they're sitting on the launch pad for days. north korea has moved on now to solid fuel technology. much more efficient. they can put it on mobile missile launchers, launch very quickly. that's what north korea is using right now they. they're developing the old chevy while keeping the porsche shined and waxed and ready to go. >> will, thank you for that context. we appreciate how much you know and you can help us understand what's going on there today. so is the president's security clearance threat just a distractio...

>> north koreans will have to renounce once and for all the development and use of nuclear weapons, they are a long way from that. but by some chance the chinese or the pressure from south korea were such they did that, i would not rule it out, but at-this-point that is a long way away if it were to happen. arthel: jay to something you said, you said everyone should be patient, whatever is going to happen with china, putting pressure on china to put pressure on north korea it will take some time. you know, the -- people have you know i'd say condemned the former presidency, and his administrat...

Work in with the intelligence community and in and with the pentagon where north korea is concerned, what keeps you up at night? >> well, north korea, brian, is really trying to perfect the element of surprise. for many years, when they would stack those missiles on the launch pad, analysts from our country and around the world were able to spy at those missiles. and we really had the opportunity to shoot them down and make sure they didn't even get off the pad in some case. but now what they're doing, what the north is doing is they're trying to put them on the back of trucks, make them mobil...