Alan Chong, associate professor at the S. Rajaratnam School of International Studies, said: “both Mr Trump and Mr Kim must go home from the summit with something to show. Everyone must feel good and all the pictures need to be perfect, but the details were left to the aftermath. This summit is a good start… but you must watch for deeds, not words, in the aftermath. The North Koreans have been known to go back on agreements. This is a day to be remembered positively, but let’s be cautious.