Ukraine’s commander-in-chief has acknowledged that a five-month-long counteroffensive has largely failed to recapture territory lost to Russia’s invasion. General Valery Zaluzhny compared the impasse to battles during World War I in which vast numbers of troops were killed retaking small patches of territory in brutal trench warfare. His comments came as Ukraine’s military reported Russian shells have fallen in nearly 120 settlements over the past day in some of the heaviest bombardment of the war. The U.N.'s humanitarian affairs office reports more than 9,900 civilians have been killed since the start of Russia's invasion — an average of nearly 16 civilians killed every day. Ukraine is now the most heavily mined country in the world; its government estimates a third of its territory is covered in mines and unexploded ordnance.