President Donald Trump shakes hands with South Korean President Lee Jae Myung as he receives a gift of a gold crown and an award of the Grand Order of Mugunghwa, not seen, during a high honor ceremony at the Gyeongju National Museum in Gyeongju, South Korea on Oct. 29, 2025. AP Photo/Mark Schiefelbein
U.S. President Donald Trump announced Thursday that the United States will share sensitive nuclear propulsion technology with South Korea so that the U.S. ally can build a nuclear-powered submarine to counter regional threats, such as from China and North Korea.
The announcement was made via posts by Trump to Truth Social after a Wednesday summit with South Korean President Lee Jae Myung. In addition to the nuclear technology sharing, leaders discussed modernizing their military alliance and trade deals.
