The flight wasn't over North Korea, and it was part of an ongoing exercise with South Korea, who are our allies.
However, it was quite obviously a deliberate show of force in light of the situation, even though inert munitions were dropped.
Whether you think it was necessary or not is another matter entirely. North Korea might be famous for not following up on their threats, but I'm wondering whether it's worth chancing boy-cried-wolf when it's a new leader threatening to nuke us.
Just saying... the logic of putting the name "North Korea" on the "Oh You!" dog meme, in essence, probably isn't a better solution.
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