[The inter-Korean summit was a success] from the perspective of its optics, pageantry, and preparation. The Joint Declaration is largely a compilation of past bilateral agreements between Seoul and Pyongyang dating all the way back to 1972, virtually all of which ended up in failure. And [Donald] Trump's breathlessly positive response to the summit suggests he could fall into a North Korean trap at a US-DPRK summit if the North Koreans offer him even a minor concession. Kim Jong Un's skills as a tactician and a negotiator were on full display at the Panmunjom summit. Let's hope that President Trump's advisers are preparing him particularly well for his meeting with Kim. He's about to meet a real pro.