North Korea and the Kim's have been doing this for decades, usually on a weekly basis. Most of the time, unless it's a very quiet news day, it is completely ignored by the media. The only this that is different about the situation now and 10 or even 20 years ago is the person in the White House. 99% of the rest of the world understands what is going on and most world leaders are happy to ignore or even humour North Korea and just keep it under intense surveillance, but of course in the White House now we have someone who doesn't have the first clue about anything let alone this situation, and at his own admittance, he had to learn from it in a quick summation from the Chinese leader. Kim is just pushing Trumps buttons and the idiot is so thick, eager to exert his power and show off, volatile, thin skinned, inexperienced, arrogant and easily provoked that he might just fall for the tricks and escalate the situation to a level that will be impossible to back down from or get out of and that is really quite worrying.
Kim is a highly educated man, he's also extremely aware of global politics, his countries standing and what powers he has and how far he can push things. Although he is a complete and utter fruitbasket and homicidal sociopath and his treatment of his countrymen and women is absolutely abhorrent, if he has developed nuclear capabilities then he really will push the "USA (or world) does not negotiate with terrorists" line to the absolute limit.
