When Donald Trump meets North Korean leader Kim Jong Un on Tuesday for perhaps the most significant nuclear talks since the Cold War, the American president will have his link to the U.S. nuclear arsenal nearby at all times.

As the leader of a newly minted nuclear state, much less is known about how Kim maintains control of his nuclear arsenal while he travels.

Kim began the year by declaring to the world that “a nuclear button is always on the desk of my office,” which was widely interpreted as an allusion to his personal control over North Korea’s nuclear arsenal.

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