Foreign Minister Yun Byung-se has questioned North Korea's membership in the UN considering its nuclear and missile provocations.
In an interview with the Associated Press in New York on Tuesday, South Korea's top diplomat said all UN members should "ask themselves whether North Korea is really qualified as a member of the UN."
Yun, who is attending the UN's annual gathering of world leaders, said Pyongyang's fifth nuclear test was on the scale of a "Hiroshima-sized explosion" and that it is becoming an "existential threat" to South Korea and a growing menace to the world.
He stressed that if the North succeeds in developing nuclear-tipped missiles, it will be a threat not only to South Korea and Japan, but also the United States and almost all other nations. Calling the North a "serial offender," Yun said the UN Security Council needs to close loopholes in existing sanctions.