Group 1 - The core point of the article is that South Korea and the United States have finalized a joint statement regarding tariff and national security negotiations [1][3] - South Korean President Lee Jae-myung announced that both countries have reached an agreement on advancing the construction of nuclear-powered submarines in South Korea [3] - The agreement includes plans for continuous optimization of related systems, aiming to allow not only U.S. commercial ships but also U.S. military vessels to be constructed in South Korea [3]