We talked to Don Kirk CBS news correspondent there in Seoul the morning Don. Are. Well good evening com tell me about the the latest thing that North Korea. Got involved with. Well they tested this new. Jet engine. We're you know that they attended on the propulsion engine rocket engine that is believed to be able to. Do you use to name long range missile that. Possibly its cable region in the US however there also believed to be quite far from. And be able to make use of this so that they really don't. Other technology to bring it back in the atmosphere after it's sort way up there. And and so it just one step on the way to developing an account ballistic missile at the finals well. So this Kim Jong milk. Is is seen just trying to develop a nuclear missiles that can reach United States so he can. Pavel claims that they've grown up table bomb Maury is he hell bent on using that once he gets it and effects of delivery system. The gate using I think so they eat what can be quote does great threat against the U. He thinks that he has that capability of the delivering nuclear war of the US and which which will be on the tip of this lower rates missile that he had a tremendous bargaining. With a minute tremendous bargaining position. The other side of that story is that. The US said others decide that a preemptive strike to wipe all of this so I'd powered. Stuff. Might might also be a good ideas so Tony's really dig music risky he's doing it in defiance. The US and show. And Japan. And so you know it is not sure now want to go to this but he certainly looked Holbrooke out there anyway. I it's a secretary of state Rex Tillerson says. You know 1 morning and take a preemptive strike off the table and and what China asked him a kind of back off to the rhetoric a little bit. That is certainly didn't give him. To call the rhetoric can it took some weapons polling very diplomatic role. That urging it to do occur and again North Korea do it. Do the cut out its nuclear and missile program. Definitely agree. With the tiny sentences on diplomacy first. Time he talked a couple and he took a couple of positions near Seoul saying that there. All options are possible options are on the table leaving open the possibility of preemptive strike he didn't use quite that strong language in Beijing. Which doesn't mean but he doesn't hold that position but simply eat. Realized that it beat out the way in Beijing. He might get any support at all from China. Let's let's struck two lines one album is. No. In nothing's done no preemptive strike no measures know anything where to birdies saying. This leads in terms of North Korea nuclear weapons etc. if we don't do anything. Picnic people. With this program. I think ago. Keep. Developing. This long range ballistic missile. And I think they're going to keep on. They get fitted to be miniaturized and make him to put on the coat knows that. Could nuclear war. To. I don't think they're going to create. Poll what it's doing. Actually. You in the maybe maybe. These them. At the end that frankly people. Not to be able. To do and I think policymakers I don't want to do. Well let me ask you this we're talking to doctor CBS news correspondent in Seoul South Korea. Armed. Let's draw another line and what happens if the United States takes three or what could happen if the United States. Takes preemptive action and bombs on North Korea. Lot can happen. One thing really could retaliate right. Firing artillery. Or missiles or nuclear war but simply aren't as in cap and across the demilitarized zone between the two Koreas totally about. Thirty or forty miles out the DMC. Then deport an idiot and she was sick and they'll. It is even co authored two North Korea so they can take that kind of activity in the and hundreds of that people's agreeing to create total chaos in South Korea. And that would be happy about a preemptive strike to do and forget about getting North Korean give up its nuclear missile program and so it did do. China would do alive which he North Korea were defeated in the Korean War and do you ride on the streets again on the Japanese record that would be the it is the this the North Korea's missile and nuclear facilities. I we're in danger of a northeast Asian. About. This second career award in northeast Asia so the debate Maria strike. And mud island asking about is the amount of US troops in the placement of them in South Korea. So if North Korea were to bomb sort firing upon South Korea. The United States troops get involved in that and if so then we're in a war with Korea. It would create yet that you offense 28500. Troops. In South Korea. In the brigade a couple of brigades of between. The line of electric. And so. The US headquarters military headquarters. Is it and so. Of them concentrated throughout the result near the near the year basis and so on in a town name you wrong tack it wasn't that. Military. Headquarters and so most of moved out there and a lot of these troops that north of Seoul also spoke to move down there. We have view would you tell those. Videos on air base. You know. I rate of fighter planes. It's so that you have a lot of ways of Calgary North Korea if North Korea would have and so part artillery on silk. But maybe inviting. Did strikes retaliatory airstrikes. There are concentrations north in the demilitarized zone again I just. Just some active within a few seconds ago there would be in danger of a second Korean War where even northeast Asian regional war. Well thank you Don appreciate your time and I'm sure will talk to you again. Today Dunkirk CBS news is good evening gun Dunkirk CBS news correspondent in Seoul. South Korea will talk more we come back should the United States act preemptively. With North Korea because right now they don't have a nuclear weapon that they can attach to a rocket. And launch successfully. So do we act now or do we wait until they do.