Trump’s nuclear submarine approval exposes enduring asymmetry in US-ROK alliance



Analysis Trump’s nuclear submarine approval exposes enduring asymmetry in US-ROK alliance Symbolic green light grants momentum, but congressional and legal barriers will keep Seoul dependent on Washington Joon Ha ParkOctober 30, 2025 SHARE COPY LINK FACEBOOK X LINKEDIN MASTODON U.S. President Donald Trump and ROK President Lee Jae-myung, and the ROK Navy’s new 3,600-ton Jang Young-sil (SS-087) submarine, launched at Hanwha Ocean’s Geoje shipyard \| Image: Official White House Photo by Daniel Torok, ROK Navy (Oct. 22, 2025), edited by Korea Pro U.S. President Donald Trump’s public “approval” for South Korea to build nuclear-powered submarines marks a symbolic shift in Seoul’s maritime ambitions but leaves the project constrained by legal, technological and political barriers that make deployment unlikely before the 2030s. While Trump’s endorsement signals Washington’s willingness to discuss an issue long off-limits, it remains largely performative without corresponding action under U.S. law. Trump announced via social media on Thursday that he had given South Korea permission to develop nuclear-powered submarines after President Lee Jae-myung requested cooperation during their bilateral meeting in Gyeongju. He later addedthat the submarines would be built © Korea Risk Group. All rights reserved. No part of this content may be reproduced, distributed, or used for commercial purposes without prior written permission from Korea Risk Group. LATEST ANALYSIS 01South Korea’s CPTPP push exposes the cost of turning trade gains into consensus 02AI storage boom gives South Korea battery makers an EV overcapacity lifeline 03South Korea’s Mexico strategy runs into the hard limits of USMCA politics 04Preschool test ban forces South Korea’s English hagwons to rethink placement 05Lee Jae Myung’s Wall Street pitch tests South Korea’s capital market credibility 06US midterm clock raises stakes for South Korea’s $200 billion investment talks 07Lee’s Hormuz red line tests South Korea’s leverage in $350 billion US talks 08South Korea’s AI data center boom is colliding with the true cost of power

Analysis

Trump’s nuclear submarine approval exposes enduring asymmetry in US-ROK alliance

Symbolic green light grants momentum, but congressional and legal barriers will keep Seoul dependent on Washington

Joon Ha ParkOctober 30, 2025

Trump’s nuclear submarine approval exposes enduring asymmetry in US-ROK alliance

U.S. President Donald Trump and ROK President Lee Jae-myung, and the ROK Navy’s new 3,600-ton Jang Young-sil (SS-087) submarine, launched at Hanwha Ocean’s Geoje shipyard | Image: Official White House Photo by Daniel Torok, ROK Navy (Oct. 22, 2025), edited by Korea Pro

U.S. President Donald Trump’s public “approval” for South Korea to build nuclear-powered submarines marks a symbolic shift in Seoul’s maritime ambitions but leaves the project constrained by legal, technological and political barriers that make deployment unlikely before the 2030s.

While Trump’s endorsement signals Washington’s willingness to discuss an issue long off-limits, it remains largely performative without corresponding action under U.S. law.

Trump announced via social media on Thursday that he had given South Korea permission to develop nuclear-powered submarines after President Lee Jae-myung requested cooperation during their bilateral meeting in Gyeongju.

He later addedthat the submarines would be built

Trump’s nuclear submarine approval exposes enduring asymmetry in US-ROK alliance

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Joon Ha Park