TOPSHOT - People watch a television news programme showing file footage of North Korea's projectile weapons, at a railway station in Seoul on May 9, 2019. - North Korea welcomed a US envoy's visit to Seoul by firing at least one projectile for the second time in just six days on May 9, the South's military said, as Pyongyang seeks to up the ante in deadlocked nuclear negotiations with Washington. (Photo by Jung Yeon-je / AFP)