Updated October 29, 2025 at 3:40 PM MST

President Trump says he has given South Korea permission to build a nuclear-powered submarine following trade negotiations in the country, saying in a post on Truth Social that "Our Military Alliance is stronger than ever before."

Trump followed up in a separate post to say that the submarine would be built in Philadelphia. "Shipbuilding in our Country will soon be making a BIG COMEBACK," he wrote .

It's unclear what the timeline for such a project would be.

The news followed earlier announcements about trade and investment plans between the two countries. The U.S. and South Korea affirmed that Seoul is investing $350 billion into the U.S. following months of trade talks, including how that money would be distributed.

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