From a New York Times story by Marc Santora, Peter Baker. and Michael D. Shear headlined “Biden Visits Kyiv, Ukraine’s Embattled Capital, as Air-Raid Siren Sounds”:

President Biden made a surprise trip to the embattled capital of Ukraine on Monday, traveling under a cloak of secrecy into a war zone to demonstrate what he called America’s “unwavering support” of the effort to beat back Russian forces nearly a year after they invaded the country.

Mr. Biden arrived unannounced early Monday morning to meet with President Volodymyr Zelensky, and the two stepped out into the streets of Kyiv even as an air-raid siren sounded, a dramatic moment captured on video that underscored the investment the United States has made in Ukraine’s independence.