I have been watching a documentary about the second world war and it is very complicated the way it came about as the result of unrest across so many different countries. I do not think you could have a 'world' war off the back of the spat just between North Korea and U.S. Why would the rest of the world be drawn into that?

if it really came to it, north korea could be silenced by the U.S. in no time so my answer is no.