It was the clearest sign yet that the on-again off-again summit between Trump and Kim is likely to be held as initially agreed, in Singapore on June 12.
Browsing: President Moon Jae-in
Earlier on Saturday, Kim invited Moon for talks in Pyongyang, setting the stage for the first meeting of Korean leaders in more than 10 years
North Korea is under heavy international pressure to end its weapons programmes, pursued in defiance of UN Security Council resolutions.
The protest came as President Moon Jae-in and his US counterpart Donald Trump are set to meet in Washington D.C. next week.