The only reason NK even has the "guts" to sabre-rattle is because China still grudgingly honours its "debt" to them. The day China says, "Enough is enough, you're on your own." North Korea is toast.
ADD] Heck, other countries wouldn't even need to invade North Korea. China just needs to cut off its supply line to North Korea and North Korea will implode on its own.
Natch.
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