Try searching you may find evidence. Or look back through the older DPRK posts/threads here.
Russia and China were advocating, for their own reasons, denuclearisation of the peninsular whilst goldilock's nuclear tipped armada was off the coast of DPRK and nuclear capable bombers in the air from Guam flying along the demarcation line.
Whether Kim's desire to 'work towards' denuclearisation stops at the peninsular, has not yet been revealed, publicly.
All businessmen and woman say what the customer wants to hear. Whether they deliver; what was discussed, promised, included in the signed legally binding contract or they suddenly find that, if they do deliver, they are now breaking a new domestic law introduced by a politician's diktat, that is the sign of an honourable businessman.
.
Boeing's, now cancelled billion dollar Iran deal a superb example, look it up. Airbus has been fucked due to the same diktat because they use some arbitrary % of ameristani produced components. This restriction has been there for years, but recently ameristan produces any number or illegal reasons to non-deliver legally agreed contractual products and services.
The Europeans have not lied, they signed contracts with Iran and were developing/investing their companies money in Iranian projects. Currently they are scrambling to organise a method to continue the projects. Unfortunately once again ameristan is using it's financial/military position and threatening further illegal sanctions if the Europeans to not "bend their knees" to their master.
You surely understand now why companies and countries only buy ameristani products and services as a last resort.