SEOUL/HANOI (Reuters) – South Korea will work with the United States and North Korea to ensure they reach agreement on denuclearization, the South’s president said on Friday, a day after talks between the U.S. and North Korean leaders collapsed over sanctions.

A second summit between U.S. President Donald Trump and North Korean leader Kim Jong Un, in Vietnam, was cut short after they failed to reach a deal on the extent of sanctions relief North Korea would get in exchange for steps to give up its nuclear program.

South Korea’s President Moon Jae-in has been an active supporter of efforts to end confrontation on the Korean peninsula, meeting Kim three times last year and trying to facilitate his nuclear negotiations with the United States.

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