No US president has ever met a North Korean leader. Madeleine Albright visited North Korea’s Kim Jong Il, but Bill Clinton was unwilling to go unless it was clear what such a meeting could achieve. A meeting with a US president is valuable to the North Koreans, but America has always declined an official visit unless a deal that will deliver a significant return is on the table. President Bush engaged North Korea in the six-party talks (two Koreas, Japan, US, Russia and China), thus avoiding Pyongyang incitements to secure its goal of direct talks. Barack Obama came to power vowing to talk directly to America's enemies, but concluded it was wrong to pander to North Korea's provocations. Trump’s potential visit (or meeting elsewhere) has given North Korea’s dynasty the prestige and propaganda that it craves, and is consistent with Trump's vow to be a disruptive global force, able to unpick one of the world's most intractable conflicts.