Seoul, South Korea CNN —North Korea on Friday claimed it had successfully tested an underwater nuclear weapons system earlier this week in response to naval drills by the United States, South Korea and Japan. North Korean state media on Friday did not show evidence for the success of the latest test, but warned the US, South Korea and Japan of the “catastrophic consequences” of their actions. Warships from South Korea, the US and Japan perform a trilateral exercise in the waters south of Jeju between January 15 and 17, 2024. South Korea's Defence MinistryAnalysts say it all points to an even more intractable North Korea. “If North Korea’s artillery fire near the inter-Korean maritime border was just part of routine training, it would be less concerning.

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Persons: ”, Carl Vinson, KCNA, Kim Jong Un, Kim, Kim Jong, Kim ramped, Staff Kim Myung, Leif, Eric Easley, Easley Organizations: South Korea CNN, Korea Central News Agency, JS Hyūga, Korea’s, Chiefs, Staff, Warships, Korea's Defence, US Navy, Fleet, People’s Assembly, CNN Relations, South Korean Joint Chiefs, Korea's Defence Ministry Analysts, Ehwa University Locations: Seoul, South Korea, North Korea, United States, Japan, Korean, Pyongyang, Jeju, U.S, Republic of Korea, Korea, KCNA, North, “ Pyongyang