Is Donald Trump reviving the "madman theory" of diplomacy, introduced by Richard Nixon to instill fear in America's adversaries? North Korean leader Kim Jong-un's description of Trump as "mentally deranged" suggests that such a ploy might be working – or else Kim is more right than he, or the rest of us, would like.
worries that the US president's erratic behavior vis-à-vis North Korea is not an act.
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