South Korea¡¯s pursuit of nuclear-powered submarines is gaining traction following U.S. President Donald Trump¡¯s endorsement, ending decades of U.S. resistance in a move that could reshape Asia¡¯s security landscape and escalate an underwater arms race.

Seoul has long sought to join the elite group of nations operating nuclear submarines to counter North Korea. Trump¡¯s approval removed a key barrier by granting access to fuel under a nuclear agreement between the countries.

Still, South Korea¡¯s rapidly developing program could irk China and pressure Japan to develop similar capabilities, analysts and former military officials say.