Strategic Ukrainian port Mariupol 'blockaded' by Russian forces
What you need to know:
Russia's defence ministry announced a ceasefire Saturday to allow residents of two Ukrainian cities that were surrounded by Russian forces, including the strategic port city of Mariupol, to evacuate.
Ukraine's strategic port city of Mariupol is under a "blockade" by Russian forces after days of "ruthless" attacks, its mayor said on Saturday, calling for the establishment of a humanitarian corridor.
Located on the Sea of Azov, the city of 450,000 people has been bombarded by shellings and cut off without water or electricity in the depths of winter.