Week one: Tragedy and uncertainty haunt Ukraine

Seven days into its invasion of Ukraine, Russia intensified its bombardment of cities amid mounting casualties and streams of refugees pouring out of the country. More than 1 million people have fled Ukraine, in the swiftest refugee exodus this century, the United Nations said Thursday, as Russian forces kept up their bombardment of the country’s second-biggest city, Kharkiv, and laid siege to two strategic seaports.

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