the uss michigan, a nuclear-powered submarine also arrived in the port city of pusan today. angered by the buildup and threat of further sanctions, the regime has stepped up its rhetoric, unveiling new weapons while lashing out at its adversaries. north korean media called the movement extremely dangerous, saying the u.s. should consider carefully any catastrophic consequence. >> this raises the stakes. >> reporter: analyst jonathan polak says the white house needs to proceed cautiously. >> with the united states and others talking far too loose lay of the prospects of a preemptive strike, that's what would trigger retaliatory actions by north korea. >> reporter: it's also been three days since tony kim was detained at north korea's airport. >> we could stumble needlessly into what would be the biggest crisis in east asia since the united states intervened in the korean war in 1950. >> reporter: to avoid that, president trump is working closely with china. he's already spoken with china's president twice in the past two weeks. >>> first daughter and white house adviser, ivan

. >> reporter: the "uss michigan" docked at pusan port on tuesday, described as routine and show of forcen the u.s. military. "the uss carl vinson" heading back to the region and u.s. missile defense system thaad is arriving in pieces and to be fully operational as soon as possible. unmistakable build up of u.s. military assets and no matter how routine this live-fire drill may be, it is an image that is not lost on north korea. so these joint military drills between the u.s. and south korea last for two months. they end at the end of this month. it is very unlikely that is when the tensions will end and i infuriated north korea. when you see how much military hardware is here right now. alisyn. >> paula, thank you for bringing us those pictures. >>> another provocative action by the iranian ship in the persian gulf. it came within 1,000 yards of the u.s. war ships with the systems banned. >>> you ready? you have to see this. a research team is creating a device that mimics a pregnant mammal's womb. they made a womb. the medical journal reported a fetal lamb successfully grew in the devic

we went to pusan and drove up south korea to get to our war positions in the north. active plans to do this. they are practiced every year. there are war games going on right now. it is because of the conflict with the north and south. >> gordon, that leaves us open to rex tillerson and he is open to talks. how big of a change? >> it is a change from the vice president and what he said a week ago during the trip to asia. we have president trump saying there could be major conflict. i think that is trying to intimidate the north koreans. tillerson and haley will try to get sanctions resolution through the security council. i think what they are doing is trying to intimidate the 15 members of the council. saying if you don't impose tougher sanctions and enforce, we have other options. >> does president trump saying we could have a major, major conflict with north korea. does that work to intimidate the north koreans? >> i think so. they don't know where trump is coming from. they may say we heard this before. trump is a different type of president than what we have see

strike group and talked about the nuclear submarine that arrived in the waters that made a stop in pusanuth korea and the u.s. they say they are not alarmed and have faith in their leader kim jong-un that he has weapons and manpower to fight back against the u.s. now, of course, this is a nation where there is political dissent so there's nothing but support. >> that spooky wake-up call is so jarring when we come to you at the half hour. when it comes to you, will, china has always taken positions to condone their fellow communists in north korea, but there are signs now that china mighting sending more of an aggressive message to kim jong-un to cut it out, right? >> reporter: yeah. obviously the chinese government is pretty restrained in the statements that they put out but "the global times," a state-run news outlet puts out more provocative editorials that give us insight into what the government is thinking because that's, of course, sanctioned by the state. i want to read you an editorial out hours ago. if north korea carries out a sixth nuclear test as expected it's more likely tha

pusan i remember when i had one. [laughter] so they could culturally perform in ways that we couldn't but there is no particular reason to think and that is the terms of the book but objectively and undeniably that this fellow was nothing they did not have the ability to learn we can if we choose to one thing the book is about is returning to some of the things we is to understand. the third day is it happened fast it takes between one and three years to carry out a regime unchanged like a chemical reaction you cannot undo that the sexual this very interested in the defense of chemical reactions and a physical reaction that is like baking a cake if you bake the cake you cannot go back to the ingredients the weather regime changes will not go back and then there is a war that takes between one and three years and that means it is already a underway which means you have to act quickly but how does it happen fast? by appearing not to happen that all but reducing the way your experience the confusion and that is in all h