The second summit between U.S. President Donald Trump and North Korean leader Kim Jong Un at the end of this month in Hanoi, Vietnam might seem at first like a serious case of déjà vu.  

Once again, the two leaders, having invested their personal capital and reputation in this diplomatic process, are driving the summit and stand to gain simply by meeting.

Trump hopes to augment his credentials – fiercely challenged in the U.S. domestic political debate – as a dealmaker. Kim, for his part, likely gains leverage at home from successful summits on