Several large Ukrainian cities were attacked, including the capital, Kyiv, as well as Dnipro, Lviv, Odesa and Kharkiv.

Ukrainian president Volodymyr Zelenksyy called the attack on a Dnipro medical clinic a "crime against humanity." Video of the scene showed smoke pouring out of a badly damaged building.

The city, an island of relative safety surrounded by fighting, has become a hub for humanitarian aid and for people fleeing the war in the Donbas and other parts of Ukraine.