Pyongyang envoy Ri Song Chol interrupted the conference yesterday when he tried to deliver a statement following the poignant testimony of Joseph Kim who fled North Korea as an orphaned, homeless and hungry teenager.
US Ambassador Samantha Power ordered UN staff to turn off the North Korean diplomat's microphone and security guards were dispatched to the conference room at UN headquarters.
The three diplomats then stood up and left the room telling reporters that they were denied the opportunity to speak as a UN member-state.
He blasted the event as a "one-sided political drama."
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Power in turn accused the North Koreans of "bullying," saying that they were told beforehand that they would have an opportunity to speak.
"The delegation chose instead to try to drown out the testimony of these panelists," she said.
The conference opened with testimony from Joseph Kim who watched his father die of starvation at the age of 12.
Kim eventually fled to China and arrived in the United States eight years ago as a refugee.
At the age of 10, Jay Jo fled to China with her mother following the death of her grandmother, who starved while digging for grass.
She recounted how her father was sent to a prison camp for scavenging for food and died there.
Kim appealed to delegates to "continue lending an ear to the story of the North Korean people" so that "we can bring light to the darkest corners of the world's most isolated country."
The UN Security Council in December held its first-ever meeting on the human rights crisis in North Korea despite objections from China, which said the matter should be discussed in other UN settings.