this is new video into cnn just a short while ago in kharkiv, the second largest city in ukraine. this was a police building. also hit in this attack, we're told, a university complex. at least four dead, several others injured. a firefighting operation now under way there. let me give a sense where it is. the upper northeast part of the country, kharkiv. you can see the russians moving ever closer to the city. our frederick pleitgen is over the here in belgorod. >> reporter: as you correctly