The North Korea leader's temporary disappearance and rumours of ill health have put the spotlight on his sister Kim Yo Jong as a potential successor. The FT's Korea and Washington correspondents talk to Jung Pak, author and former CIA officer.

See if you get the FT for free as a student (http://ft.com/schoolsarefree) or start a £1 trial: https://subs.ft.com/spa3_trial?segmentId=3d4ba81b-96bb-cef0-9ece-29efd6ef2132

► Check out our Community tab for more stories or to suggest videos.
► Listen to our podcasts: https://www.ft.com/podcasts
► Follow us on Instagram: https://www.instagram.com/financialtimes