Its what happens when Blix comes back like Otto Warmbier?
Or what happened to Iraq when Saddam decided not to co-operate with the inspectors. Baghdad having agreed to conditions then deceived, obstructed, and threatened international inspectors sent to dismantle and verify the destruction of its banned programs for the next eight years.
North Korea would seem to have been reluctant to co-operate in any way for rather longer.
https://www.armscontrol.org/factsheets/dprkchron