Again the basic difference between regular missiles and ICBMs is the “first” keep flying as long as their liquid fuel does not run out. They are loaded with it; there is no room left for a large enough nuclear bomb. They run out of fuel after 1,000 or 2,000 miles or much sooner.
ICBMs are launched straight up into low orbit, then they keep flying without burning fuel. In orbit, they have to be kept under precise electronic control so they can be directed down (out of orbit) when they reach the area of their target, then be precisely targeted to where we want them to hit. To keep that control of them, in and out of orbit, ships with the proper equipment have to be stationed in the oceans of the world. Also, properly equipped planes have to be in the air for that all the time.
North Korea does not have this equipment or facilities to control missiles in orbit, therefore they do NOT have ICBMs (Inter-Continental Ballistic Missiles).
Unfortunately, we smart Americans have no idea about these details or are not interested. And we believe what we hear on the news and what we read in the papers. Our news media and papers love to use the word ICBMs. (That is Trump-controlled fake news, in my opinion.) He loves it. He needs a war to keep his presidency.