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In the blink of an eye, the atmosphere on the Korean Peninsula went from one of fear and uncertainty to one of hope — for an end to a decades-long war and, ultimately, for peace.

The North Korean leader Kim Jong-un’s talk of denuclearization during his recent meeting with the South Korean president, Moon Jae-in — coming on the heels of a rapid acceleration of nuclear missile testing — left some wanting a deeper explanation of the seemingly sudden change in rhetoric.

So our Tokyo bureau chief, Motoko Rich, went live on Facebook from the headquarters of The General Association of Korean Residents in Japan to help viewers make sense of the shift in tone.