It's the art of the deal. Give everything away and declare victory.
America the nation, and enough of its voters to elect a president, is no longer leader of the free world. It's the new home of authoritarianism and instability.
Any US president could have had a meeting with Kim in return for nothing material. What is meaningful is that Trump is taking the US in the direction of dictatorship.
Next stop Russia to visit the leader of the Republican Party.