With his schoolyard exchange of taunts with Kim Jong-Un, Trump has weakened American security. His threats have proven meaningless. 

Another missile test? "Won't happen," but it did, over and over. 

"We are sending an armada, very powerful," but the "armada" was 2,000 miles away, sailing in the other direction. 

"North Korea best not make any more threats to the United States…They will be met with fire and fury like the world has never seen," and North Korea immediately fired a long range missile over Japan, in the direction of Guam, and nothing happened.

With every tweet, Trump proves that he is unfit for his office, the he really is more interested in polishing his ego than in finding a peaceful and permanent solution. The more he tries to make Kim fear a pre-emptive American strike (which would have disastrous consequences), the more Kim will be driven to accelerate his nuclear weapon delivery systems.