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Technological step to go from an under ground test of a nuclear device to putting a nuclear war head on a long range missile. and the north koreans are not believed to have made that leap yet. but the u.s. is taking no chances, constantly honing its missile defense capabilities with the less than easy aim of shooting down any north korean missile ever headed towards the u.s. and, sandra, if we take kim jong-un at his word, those u.s. missile defense capabilities will be tested by a real attack at some point in the not too distant future. sandra? >> sandra: all right, jonathan hunt, thank you. ...

Dangerous. over the weekend, a ground test of a high thrust rocket engine. south korea says it's a threat. >> it is found that the engine function has made progress. >> experts tell fox news pyongyang is getting closer to hitting the u.s. with a nuclear weapon. >> within four years, north korea will be able to make a nuclear warhead to their longest range missiles and then they will be able to hold the u.s. to ransom. >> secretary of state tillerson ending his trip to the region. in south korea, he said a military preemptive strike against north korea was on the table. north korea saying today...

It's a new high-thrust mission. this test shows the north koreans have made meaningful progress with their rocket engines. tonight experts warn of what this could mean. >> the constant testing, ground test with flight test means they're making progress that threaten the region. >> reporter: two u.s. defense officials tell cnn they believe this missile could be placed on ballistic missile that could hit the u.s. they're studying it. outside experts say this is too big to fit a missile. this will launch satellite to orbit. >> could it be adjusted to fit into a long-range missile? >> it could by ...

Dangerous. over the weekend, a ground test of a high thrust rocket engine. south korea says it's a threat. >> it is found that the engine function has made progress. >> experts tell fox news pyongyang is getting closer to hitting the u.s. with a nuclear weapon. >> within four years, north korea will be able to make a nuclear warhead to their longest range missiles and then they will be able to hold the u.s. to ransom. >> secretary of state tillerson ending his trip to the region. in south korea, he said a military preemptive strike against north korea was on the table. north korea saying today...

Stage. >> how close is he to having a deployable long-range missile? gathering intelligence inside the secretive regime is difficult. he could have that ability or be three years away. u.s. officials say there is a crucial part of that capability they believe the north koreans haven't perfected yet. >> what they haven't done is not only launch the missile but have it re-enter for intercontinental range. having said that, they have done some other things that might cause worry. this is an example of a ground test that simulates the heat attached to reentry using another missile edge to burn up ...