Who has Kim Jong Un's 'nuclear button' in Pyongyang while he's away?

FILE PHOTO: North Korean leader Kim Jong Un watches the launch of a Hwasong-12 missile in this undated photo released by North Korea's Korean Central News Agency (KCNA) on September 16, 2017. KCNA via REUTERS

SEOUL (Reuters) - 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.

Graphic - North Korea's missile programme: http://tmsnrt.rs/2t0oSv7