I absolutely despise that Trump describes his 'very good relationship with Kim Jong Un' as a pretext for this action. Kim Jong Un is fucking evil - full stop. Shame on you, Donald. Yes, I get that Trump wants to degrade China's influence over North Korea. That is appropriate.
South Korea's moves invited this action. They need to be reminded who their daddy is. This move should have been more nuanced, but Donald does not do nuance.
These annual military exercises are necessary but our deterrence posture in the region will not materially suffer from a one year suspension. On the whole I think this is the right move but to present it as a result of our relationship with North Korea is very misguided.