<span style="color: #222222;">Ukrainian officials said Russian shelling from heavy artillery has damaged a cancer hospital and several residential buildings in the southern city of Mykolaiv. The hospital's head doctor, Maksim Beznosenko, said the assault damaged the building and blew out windows but no one was killed.<br />''<br />''Ukrainian and Western officials earlier accused Russia of shelling a maternity hospital in the southern city of Mariupol on Wednesday. Three people died in that attack.<br />''<br />''Mariupol's mayor's office said in a statement that there is a humanitarian catastrophe in the city and the dead aren't even being buried, and called for Russian forces to lift the siege.<br />''<br />''Meanwhile, the U.N. nuclear agency said, Ukraine informed the International Atomic Energy Agency that technicians have started repairing damaged power lines at the decommissioned Chernobyl power plant in an effort to restore power supplies.<br />''<br />''On Wednesday, Ukrainian authorities said that Chernobyl, the site of the 1986 nuclear disaster, was knocked off the power grid, with emergency generators supplying backup power.</span><br />