The US president has met North Korea's leader, becoming the first US president to set foot on North Korean soil. The meeting was held in the demilitarised zone. 'I just want to say this is my honour,' Trump said, adding: 'Stepping across that line is a great honour – great progress has been made, great friendships have been made and this has been, in particular, a great friendship.' The president also took the opportunity to invite Kim to the US