text:  World leaders are gathering in Washington, D.C. for a NATO summit marking the alliance's 75th anniversary. Members are expected to hold more talks about supporting Ukraine's defenses against Russian military forces. Russia's recent security pact with North Korea is also a significant point of concern. In South Korea, the Yonhap News Agency says President Yun Sung-yeol plans to hold bilateral talks with more than 10 countries, in part about his concerns over deepening ties between North Korea and Russia.