Or Mike Pompeo, who secretly met with Kim before being confirmed as Secretary of State.

Trump is often described as narsisstic, petty, childish, unpredictable etc. and he seems much more likely to act based on personal emotions rather than "rational cost/benefit analysis". And then you have Bolton who seems to be hoping for a war.

These aren't the types most of us would want as our leaders, but they make extremely scary enemies when they are leading the most powerful military in the world.

Normally nothing serious will happen even if Russia or NK test their boundaries, and they know it. But now, with Trump and Bolton in charge, their casual threats can suddenly have real consequences for them.

I would be surprised if this didn't have a significant effect on how other countries decide to interact with the USA.