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Game Changer: Trump Approves South Korea’s Nuclear Submarine Ambition

South Korea aims to enhance deterrence against North Korea with nuclear subs, targeting four or more within 10 years, supported by U.S. fuel cooperation and approval.

  • U.S. President Donald Trump granted approval for South Korea to build a nuclear-powered submarine at shipyards in Philadelphia after President Lee Jae Myung requested fuel access during their summit.
  • The timeline envisages South Korea needing 10 years to build a nuclear-powered submarine to bolster underwater deterrence and counter North Korea's ballistic missile submarines.
  • Under the Changbogo-III program, the Navy projects a nuclear-powered submarine to be 5,000 tons or larger with uranium enrichment 10 percent or lower, after South Korea launched a 3,600-ton submarine last week and has three 3,000-ton subs in service.
  • Defense Minister Ahn Gyu-back urged South Korea to acquire four or more nuclear-powered submarines, saying, `Because we cannot exceed the nuclear submarine North Korea is preparing with diesel submarines, in terms of underwater endurance capabilities and speed, it has huge significance militarily.`
  • Seoul notes it can build nuclear-powered submarines and will rely on U.S. cooperation to secure fuel, while further bilateral consultations are needed on South Korea's Changbogo-III Batch-III project.
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The United States will share highly classified technology to enable South Korea to build a nuclear-powered submarine, President Donald Trump announced Thursday on social media, after meeting with the South Korean president.

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The Korea Times broke the news in Korea, Republic of on Thursday, October 30, 2025.
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