North Korean Diplomat Has 'No Regrets' Over Defection

Thae Yong-ho was North Korea's deputy ambassador to London before he defected in the summer. He says Pyongyang may have an effective nuclear arsenal by the end of next year. Mr Thae Yong-ho speaks to the BBC's Steve Evans in an exclusive interview.

Also on the programme: Michelle Obama and Hillary Clinton's speechwriters; Learning English in Cuba; And pioneering American astronomer Vera Rubin dies.

(Image: Thae Yong-ho. Credit: Kim Hyun-tae/Yonhap via AP)