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US President Donald Trump has abruptly cancelled a summit with Kim Jong-un, due to be held in June. Talks would have focused on ways of denuclearising the Korean peninsula and reducing tensions.

So what now? Justin Webb talks to Lieutenant General In-Bum Chun, who was deputy commander of the South Korean Army; diplomat Victor Cha, who had initially been Donald Trump's choice to be US ambassador to South Korea before being passed over; and Japanese ambassador to the UK Koji Tsuruoka.

(Photo: Protest in Seoul, South Korea, after the cancellation of the summit, credit: Getty Images)