This latest missile is at most intermediate range. This according to Russian experts not tied to the government. Quite crude, as one can expect. 
The Pentagon of course treat it and others as intercontinental able to reach America's heartland. And thus constitute an existential threat, the Pentagon favorite word. This to justify a restart of the Korean War, which it wants very much to do. China and Russia, even Iran has missiles of far greater range and power. Yet the Pentagon does not call for war with them. Yet. 
Japan attacked and took over Korea during the first half of the 20th century. The bad feeling between them has hardly subsided. A second attack from Japan on Korea will trigger total war. Since Japan also attacked China during the same period inflicted the most horrific bloodshed, you can count on China joining the war. 
Nevertheless, if the  Pentagon and Congress wants a big war, then they will have it. After all, there is never a war the American government don't like.