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Nuclear envoys from S. Korea, US and Japan meet for talks on North Korean threat

  • South Korea's delegation, center, led by Special Representative for Korean Peninsula Peace and Security Affairs Hwang Joon-kook, center top, U.S. delegation, right, and Japan's delegation, left, attend at their meeting about North Korea in Seoul, South Korea, Wednesday, May 27, 2015. (AP Photo/Lee Jin-man)

    South Korea's delegation, center, led by Special Representative for Korean Peninsula Peace and Security Affairs Hwang Joon-kook, center top, U.S. delegation, right, and Japan's delegation, left, attend at their meeting about North Korea in Seoul, South Korea, Wednesday, May 27, 2015. (AP Photo/Lee Jin-man)  (The Associated Press)

  • South Korea's Special Representative for Korean Peninsula Peace and Security Affairs Hwang Joon-kook, center, gestures after posing for the media with U.S. State Department’s Special Representative for North Korea Policy Sung Kim, right, and Japanese Foreign Ministry’s Director-General for Asian and Oceanian Affairs Junichi Ihara for their meeting about North Korea in Seoul, South Korea, Wednesday, May 27, 2015. (AP Photo/Lee Jin-man)

    South Korea's Special Representative for Korean Peninsula Peace and Security Affairs Hwang Joon-kook, center, gestures after posing for the media with U.S. State Department’s Special Representative for North Korea Policy Sung Kim, right, and Japanese Foreign Ministry’s Director-General for Asian and Oceanian Affairs Junichi Ihara for their meeting about North Korea in Seoul, South Korea, Wednesday, May 27, 2015. (AP Photo/Lee Jin-man)  (The Associated Press)

  • South Korea's Special Representative for Korean Peninsula Peace and Security Affairs Hwang Joon-kook, center, U.S. State Department’s Special Representative for North Korea Policy Sung Kim, right, and Japanese Foreign Ministry’s Director-General for Asian and Oceanian Affairs Junichi Ihara pose for the media before their meeting about North Korea in Seoul, South Korea, Wednesday, May 27, 2015. (AP Photo/Lee Jin-man)

    South Korea's Special Representative for Korean Peninsula Peace and Security Affairs Hwang Joon-kook, center, U.S. State Department’s Special Representative for North Korea Policy Sung Kim, right, and Japanese Foreign Ministry’s Director-General for Asian and Oceanian Affairs Junichi Ihara pose for the media before their meeting about North Korea in Seoul, South Korea, Wednesday, May 27, 2015. (AP Photo/Lee Jin-man)  (The Associated Press)

The top nuclear envoys from South Korea, the U.S. and Japan are meeting for talks on North Korea amid worries about the country's atomic weapons programs.

Wednesday's meeting in Seoul comes after North Korea recently claimed it had tested a new type of missile from a submarine and reiterated that it had built a nuclear warhead small enough to be mounted on a long-range missile.

Outside analysts are skeptical about the claims, but believe the North has advanced its nuclear and missile programs since international nuclear disarmament talks stalled in 2009.

Seoul, Washington and Tokyo are members of now-dormant six-party negotiations aimed at ending North Korea's nuclear weapons program in return for aid. Other members are Pyongyang, Beijing and Moscow.