The second summit between US President Donald Trump and North Korean leader Kim Jong-un has ended without any deal or agreement.

Washington insists though that dialogue with Pyongyang will continue and the collapse of the Hanoi summit is not a major disappointment.

Here's a roundup of North Korea experts looking at the summit and what to make of its sudden end.

A predictable 'no deal'
Ankit Panda, senior editor, The Diplomat

The "no deal" outcome could have been seen coming a mile away. Indeed, a serious reading of public North Korean statements since last year's Singapore summit would have revealed the core issue that resulted in a lack of agreement.

The day after the Singapore summit, North Korean state media paraphrased Kim Jong-un as noting Pyongyang would take "additional good-will measures" if the US took "genuine measures." By that date, North Korea had dismantled its nuclear testing site at Punggye-ri and announced a moratorium on nuclear tests and intercontinental-range ballistic missile tests.

Weeks later, North Korea would also partially and reversibly dismantle a missile-engine test stand.