Ukraine presses counteroffensive on key Russian line of assault - governor

Ukraine pushes back Russian troops in counter-offensive near Kharkiv

At least 500 Kharkiv residents killed so far - Ukraine officials

IAEA reports second Ukraine nuclear facility damaged

Four killed as air strikes pound Ukraine's Kharkiv

At least 21 killed, 112 wounded in shelling of Kharkiv: Ukrainian official

Russia shells Ukraine's Kharkiv as pressure on Moscow bites