The US ambassador to South Korea, Harry Harris, says sanctions will remain in place against North Korea until it gives up its nuclear weapons.
This comes as Washington and Pyongyang prepare for their second summit slated for late this month.
Speaking at a security forum in Seoul, Harris also dangled the prospect of a "brighter, more secure and more prosperous future" for the country if it fulfills its denuclearisation commitment.
Bruce Harrison reports from Seoul:

Family of alleged Bondi gunman unaware of 'radical mindset', say Indian police
Israeli forces kill Palestinian teen in West Bank, health ministry says
Trump sues BBC for defamation, seeks up to $10 billion in damages
FBI foils 'terror plot' targeting Los Angeles
Hong Kong court finds tycoon Jimmy Lai guilty in landmark security trial
Ukraine peace talks stretch into second day at start of pivotal week for Europe
Flash floods kill at least 37 people in Morocco's Safi province
'Hero' who disarmed Bondi gunman recovering after surgery, family says
