Yoon's trip to U.S. South Korean President Yoon Suk Yeol (R) boards the presidential airplane with his wife, Kim Keon Hee, at Seoul Air Base in Seongnam, south of Seoul, on April 24, 2023, as he embarks on a six-day state visit to the United States. Yoon is scheduled to hold talks with U.S. President Joe Biden on April 26 at a time of growing concern over North Korea's evolving nuclear and missile capabilities and questions about the credibility of Washington's "extended deterrence" commitment to Seoul. (Yonhap)/2023-04-24 13:58:46/ < 1980-2023 YONHAPNEWS AGENCY. .>