So wasn't a test of some kind expected today considering it's a big anniversary? Hate say it but I think Trump made NK blink.
Calling north Koreas bluff has never been the issue. The consequences of doing it are the issue. Right now is especially dangerous since Kim does not believe his inner circle is loyal. Ultimately this could end up being a test of how close his generals are to being able to form a coup.
Three generations of kims have been careful to ensure that doesn't happen by comparentalizing and frequently murdering them for suspicion and often just for show.
You want to be a general asking a potentially loyal general if he wants to plot against Kim?
You sure can't email or call each other and Kim will reward snitches.