<h1>U.S. and South Korea leaders advance implementation of trade deal with 15% tariffs, sector cooperation and defence cost-sharing talks</h1> The U.S. president hosted the South Korean president to advance implementation of a recently negotiated trade agreement that set tariffs on South Korean goods at 15% and contemplates extensive South Korean investment in the U.S.; discussions focused on sector-specific cooperation (semiconductors, batteries, shipbuilding) and potential enforcement, tariff and investment obligations. Defence talks addressed the legal and financial framework for U.S. troop presence and burden-sharing, including possible renegotiation of payments. The visit follows coordinated regional diplomacy and may affect treaty obligations, trade balance enforcement, and defence cost-sharing arrangements between the two governments.