Russia-Ukraine war: Key things to know about the conflict

With Russian’s war on Ukraine in its third week, Russian forces continued their relentless assault on the Ukrainian port city of Mariupol, shelling the city’s downtown. Ukrainian President Volodymyr Zelenskyy said Saturday that Russia is bombing Mariupol “24 hours a day.” And as Russian units also fanned out to prepare for an assault on Ukraine’s capital of Kyiv, Zelenskyy urged his people to continue their resistance, saying Russia would need to carpet-bomb Kyiv and kill its residents to take the city. Now in its third week, the war has forced more than 2.5 million people to flee Ukraine.