Diplomacy isn't exhausted, but it is unlikely to succeed at this point in my mind, but if it ultimately fails.....
sanctions, sanctions, sanctions
If Russia and China won't, battleship diplomacy, then war.
Otherwise you will be going through this every time some country makes a run for the bomb, and if N.Korea has taught us anything, it's appeasement and IAEA monitering don't work.
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WHy don't people ever learn?
EDIT: I can post again! It's a miracle!