This is the normal North Korean diplomacy, they mouth off, they expect someone to mouth off back and eventually it all goes quiet. As long as its kept to a bit of willy waving then it will continue.
Biggest worry is if Japan or USA get trigger happy after North Korea launch yet another missile into the sea, there will then be claims it was heading for land.
In a time of universal deceit - telling the truth is a revolutionary act. George Orwell
When the debate is lost, slander becomes the tool of the loser. Socrates