We've developed conventional bombs that are devastating enough that we could effectively level North Korea without using nukes.
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MOABs. Oh, what a show it would be!
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bunker busting thermobarics... to be more precise it's heat/sound echo chamber multiplicative effect weapons, basically.
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A detonation diameter of about 150 meters, it's the biggest non-nuclear "BOOM!" we got! A nice heat/pressure/concussion wave to pop humans like balloons.