Biden makes surprise wartime visit to Kyiv first US president to enter war zone

President Biden makes an unannounced visit to Kyiv, Ukraine, traveling 10 hours by overnight train from Poland, with the journey kept secret for security reasons. The visit marks the first time in modern history that a sitting US president has traveled to a war zone not controlled by US forces. Biden walks with President Zelensky near the golden dome of Mykhailivska Square as air raid sirens sound. He announces an additional $500 million in military assistance and declares that "Kyiv stands. And America stands with you." The visit electrifies Ukraine and America's European allies and becomes one of the most memorable images of Biden's presidency.