U.S. Strategy Pushes South Korea Submarines, Higher Spending, Omits North Korea
Updated (5 articles)
NSS Release Highlights First Island Chain Defense On December 5 2025 the White House issued a 33‑page National Security Strategy that reasserts a Trump‑style “Monroe Doctrine” and makes defending the First Island Chain the centerpiece of U.S. Indo‑Pacific policy, urging allies to secure islands such as Japan, Taiwan and the Philippines against Chinese pressure [1][2][3][4][5].
Seoul and Tokyo Pressed to Raise Defense Budgets The document explicitly calls on South Korea and Japan to increase military spending, praising South Korea’s pledge to lift defense outlays to 3.5 % of GDP and demanding comparable burden‑sharing from Tokyo, signaling a shift away from U.S.‑borne costs [1][2][3][4][5].
Trump Authorizes Nuclear‑Powered Submarines for South Korea President Trump’s early‑2025 approval for Seoul to build nuclear‑powered submarines is highlighted as a key element of collective deterrence, linking the submarine program to the broader First Island Chain strategy [1][2][3][4].
North Korea Denuclearization Absent from Strategy Unlike prior U.S. strategies, the new NSS contains no reference to North Korean denuclearization or nuclear non‑proliferation, prompting analysts to question Washington’s future diplomatic posture toward Pyongyang [1][2][3][4][5].
Possible Adjustment of U.S. Forces Korea Mentioned The strategy notes a plan to “harden and strengthen” the U.S. presence in the Western Pacific and hints at a review of the 28,500‑strong U.S. Forces Korea, though no concrete reduction or redeployment is detailed [1][2][4].
Sources
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1.
Yonhap: U.S. National Security Strategy Emphasizes First Island Chain, Leaves North Korea Out: Details the Dec 5 2025 NSS, its First Island Chain focus, calls for higher South Korean and Japanese defense spending, and notes omission of North Korean denuclearization .
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2.
Yonhap: U.S. National Security Strategy Emphasizes First Island Chain, Omits North Korea: Highlights the same strategy, adds the “Trump Corollary” to the Monroe Doctrine, and stresses potential USFK force‑level review .
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3.
Yonhap: New U.S. National Security Strategy Emphasizes South Korea’s Role in First Island Chain, Excludes North Korea: Emphasizes Seoul’s expanded maritime role, mentions analysts’ concerns about friction with China, and underscores the strategic shift away from North Korea .
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4.
Yonhap: U.S. National Security Strategy Highlights South Korea’s Role in First Island Chain, Omits North Korean Denuclearization: Focuses on burden‑sharing, retention of the 28,500‑strong USFK, and Trump’s submarine approval as deterrence .
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5.
Yonhap: New U.S. National Security Strategy Calls for Greater Ally Defense Spending: Points out the America‑First burden‑sharing theme, South Korea’s 3.5 % GDP defense pledge, and the strategy’s prioritization of Taiwan defense alongside the First Island Chain .
Timeline
1823 – The original Monroe Doctrine declares U.S. opposition to European colonialism in the Western Hemisphere, later referenced as the basis for the “Trump Corollary” in the 2025 National Security Strategy, signaling a revival of isolationist doctrine in U.S. policy [5].
Early 2025 – President Trump authorizes South Korea to construct nuclear‑powered submarines, a move officials describe as “a clear example of cooperation to strengthen allies’ conventional deterrence against regional threats” [3].
2025 (date unspecified) – South Korea pledges to raise defense spending to 3.5 % of GDP, becoming “the first non‑NATO ally to do so,” a commitment praised by Under Secretary of Defense for Policy Elbridge Colby [5].
Dec 5 2025 – The White House releases a 33‑page National Security Strategy that reasserts America‑First principles, introduces a “Trump Corollary” to the Monroe Doctrine, and lists defending Taiwan as “a top priority,” marking a strategic shift toward the Indo‑Pacific [5].
Dec 5 2025 – The strategy calls on South Korea and Japan to increase defense budgets and acquire new capabilities, explicitly urging Seoul to meet the 3.5 % GDP target and Tokyo to boost spending, thereby shifting more burden onto allies for First Island Chain defense [1][5].
Dec 5 2025 – The document emphasizes defending the First Island Chain—Japan, Taiwan, the Philippines—and tasks allies with building maritime capabilities, signaling a focus on countering China’s influence rather than North Korean denuclearization [1][4].
Dec 5 2025 – The strategy omits any reference to North Korean denuclearization or nuclear non‑proliferation, a departure from previous administrations that raises concerns about the future of Pyongyang’s nuclear program [1][2][3][4][5].
Dec 5 2025 – President Trump’s prior approval of South Korea’s nuclear‑powered submarine program is highlighted as a key element of collective deterrence, reinforcing the alliance’s conventional capabilities in the Pacific [1][2][3][4].
Dec 5 2025 – The NSS notes a plan to “harden and strengthen” the U.S. presence in the Western Pacific, referencing the 28,500‑strong U.S. Forces Korea baseline while signaling a possible review of force levels that could affect USFK size [1][2][4].
Dec 5 2025 – Analysts warn that Seoul’s expanded role in First Island Chain defense could strain its pragmatic economic relationship with China, potentially provoking regional tension despite the strategy’s deterrence goals [3].
Dec 5 2025 – The strategy states that the United States “will not shoulder the entire cost” of defending the First Island Chain, urging allies to share the burden through port access and collective defense arrangements [2][5].
Future (post‑Dec 2025) – The NSS signals a potential adjustment of U.S. Forces Korea numbers and continued hardening of the U.S. Pacific posture, indicating that decisions on USFK size and deployment will be reviewed in the coming years [1][2].