U.S. President Joe Biden walked around central Kyiv on an unannounced visit on Monday, promising to stand with Ukraine as long as it takes, on a trip timed to upstage the Kremlin ahead of the one-year anniversary of Russia's invasion.
Biden, in his trademark aviator sunglasses, and President Volodymyr Zelenskiy, in green battle fatigues, walked side-by-side to a gold-domed cathedral on a bright winter morning pierced by the sound of air raid sirens.
