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Trump Approves South Korea’s Nuclear-Powered Submarine Bid, Cites Philadelphia Build

The declaration marks a political step with treaty changes, export approvals, reactor choices still ahead.

Overview

  • Seoul welcomed President Trump’s statement and said it will work closely with Washington on follow-up measures.
  • Experts stressed that verbal approval does not constitute a program, pointing to the Korea–U.S. 123 agreement that excludes military uses of U.S.-origin nuclear material.
  • Officials signaled that a new or amended accord, IAEA safeguards arrangements, export-control clearances, and U.S. congressional review would be required.
  • Trump said construction would occur at Philadelphia shipyards, though Hanwha’s facility there and Hanwha Ocean acknowledged they currently lack the capability to build nuclear submarines and would need major upgrades.
  • South Korean defense leaders outlined a notional force of at least four boats and an expected timeline of roughly a decade, with fuel type decisions such as HALEU versus U.S. HEU central to feasibility and diplomacy.