⁣An air strike alert was declared in the U.S. on Wednesday morning and residents were urged to move to safer places as soon as possible amid the threat of missiles being fired by Russia. At the same time, the strategically important port city of Mariupol has been cordoned off, increasing the humanitarian crisis there. The head of the Kyiv regional administration, Oleksiy Kuleba, issued an airstrike alert, saying there was a danger of a missile attack on the Ukrainian capital.