wolf. >> brianna, stand by. pentagon officials are gaming out north korea's next moves right now. we're doing the same thing in our virtual studio. tom foreman is there along with cnn military analyst general james spider marx. walk us through this. >> sure. all eyes are on that east coast of north korea. why, general, would they do this missile placement there? two possible missiles there, why? >> tom, the east coast is closer to the united states presence and the allies. they didn't put it on the west coast because they're not trying to threaten china. >> simple enough there. let's bring in the model of the type of missile we're talking about that barbara mentioned a moment ago. this is designed to be used by soviet sub marines. the iranians have a version of it. there's no fins on it, but let's talk more about it. one of the keys is the mobility.