They have two of the most distinctive hairdos in the world and they used to trade insults. But now it appears that Donald Trump and North Korean leader Kim Jong-un have become friends. Trump made an impromptu visit to the North Korean border at the weekend and became the first serving US president to set foot in the country. They are technically still at war. The BBC’s correspondent in Seoul Stephen McDonell watched it all happen and Jean Lee opened the first western news bureau in North Korea.