KYIV (Reuters) -- U.S. President Joe Biden made an unannounced visit to Kyiv on Monday in a show of support ahead of the one-year anniversary of Russia's invasion, promising President Volodymyr Zelenskyy that Washington would stand with Ukraine as long as it takes.
Air raid sirens blared across the Ukrainian capital as Biden visited Kyiv, although there were no reports of Russian missile or air strikes.
