a) President Trump is not threatening to annihilate many countries.  Kim is.
b) Kim has stated that NK can produce as many hydrogen bombs as it wishes;  there is no reason not to believe him.
c) NK has tested 2 ICBMs and several intermediate range missiles.
d) Fascists believe in racial purity, the dominance of the state over the individual, and the use of force to accomplish their goals.  Kim believes that Koreans are racially superior, that the state is superior to the individual and can use any means necessary to control the individual, and Kim believes in the use of force to realize his goals.  Kim is clearly a fascist.
e) Nominally, Kim is a "communist," but neither he nor the regime has any truck whatsoever with the key element of communism:  "From each according to his ability, to each according to his needs."  Moreover, Kim and the élite have lots of private property which is 'streng verboten' under communism.

You have a fundamental misunderstanding of Kim and NK.

Very sad.