No
For three generations, the Kim family have blustered and threatened in order to get money, oil and food, none of which their imprisoned population and barren landscape is able to produce.
They have an impression that Trump might be less likely to supply them with such assistance, so they amp up the bluster. Plus, the current Kim is trying to look tough to separate himself from his brothers, the oldest (whom he had murdered) was frivolous and corruptible, and the middle son, who is decidedly un-masculine.
It is much less expensive to give them what they want than it is to pay in money and lives what it would cost to engage in a war in the Far East. The US is already broke. There are not enough people on Earth to buy the bonds that it would have to sell to finance a major war, and then the rebuild of S. Korea and Japan.
BTW, China has stated that if N. Korea shoots first, the US can protect it’s interests. But if US shoots first, there will be a problem. The Chinese do not want the Americans roaming around the South China Sea. It is unlikely the N. Koreans will shoot first.
Equally unlikely the Americans will either. They will simply pay up.