I would say worse case for North Korea would be a accident with explosion inside North Korea.
India vs Pakistan would be most likely cause for Nuclear weapons used.
Israel and North Korea are unofficial.
US and Russia have 90% of all Nuclear weapons.
China , UK, France have them
South Africa had them , claim no longer do? Yea Right.
Iran is very close to having their first , and that would mean Syria would have one.
Saudi Arabia will probably soon be buying some.
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