The success of the Singapore summit depends on the answer to one question. What does North Korea want from the United States in return for abandoning a nuclear defence?
The question was barely asked in public discussion before the summit or in the news conference conducted by President Donald Trump after his meeting with Chairman Kim Jong Un. Yet it is crucial to the eventual success of their historic engagement this week.
Their joint statement after the talks declared Trump was, "committed to provide security guarantees to the DPRK" and Kim had "reaffirmed his firm and unwavering commitment to complete denuclearisation of the Korean Peninsula". But those are words that have to be backed by stated actions — "confidence-building steps", diplomats call them — if peace is to be achieved.
However, Trump told the news conference he and Kim had made some undertakings beyond their signed communique, which would have been written before the summit.
According to Trump, the North Korean leader agreed in the meeting to decommission his nuclear weapons almost immediately though destroying them would take somewhat longer. And Trump has agreed the US and it allies will hold no more "war games" on the peninsula, acknowledging that they were "provocative".