https://en.wikipedia.org/wiki/Sanctions_against_North_Korea

Might want to read a tad.  Also, the repeated saber rattling using our military over there and its exercises isn't exactly a smile and a handshake.

Trump's big mouth is just more of the threats that only served to make matters worse over the past couple of decades.  His mouth is just bigger than the past two Presidents...which will make it only worse.