Donald Trump and Kim Jong-un's summit in Vietnam ended abruptly after North Korea demanded an end to sanctions, according to President Trump.

North Korea says it made 'realistic proposals at the summit'. The two leaders previously sounded optimistic about denuclearisation and had planned a signing ceremony and a celebratory lunch. But all the optimism was dashed with the abrupt cancellation of both.

So how and why did Trump, the self-styled king of dealmaking, fail again?

Watch the video above to see how it unfolded.