He will only talk to his neighbour, he has said, if North Korea shows it is serious about denuclearisation. But most experts now agree that North Korea has zero intention of giving up its nuclear weapons. It had reached this conclusion long before the war in Ukraine highlighted the perils of relinquishing such weapons, though this certainly has not helped. This gives Mr Yoon's strategy "zero chance of working" according to Chris Green, a consultant for the International Crisis Group, an organisation working to prevent wars.