From a Washington Post story by Missy Ryan, Matt Viser, Cleve R. Wootson Jr., and Alice Martins headlined “On surprise trip to Kyiv, Biden vows enduring support fr Ukraine”:

President Biden made a dramatic, unannounced visit to Kyiv on Monday, in a display of robust American support for Ukraine just four days before the anniversary of Russia’s full-scale invasion.

The high-risk visit to the historic Ukrainian capital — where air raid sirens blared as Biden walked the streets with President Volodymyr Zelensky — signals continued commitment from the United States, the largest financial and military backer of Ukraine’s effort to repel Russian invaders from its territory.