With the inauguration of President Trump’s second administration on January 20, 2025, Northeast Asia is poised for significant geopolitical changes. The evolving interactions among key regional players—including North Korea, China, Russia, and Japan—will inevitably shape South Korea’s diplomatic and security landscape. This roundtable will provide an in-depth assessment of the Trump administration’s approach to Northeast Asia and explore strategic directions for South Korea. President Trump’s "America First" policy and his emphasis on power-based diplomacy will present both challenges and opportunities, making it essential for South Korea to adapt its diplomatic and security strategies accordingly.