Maps of Ukraine counteroffensive and Russian defenses show advances, battle lines

Fox holes, hand-dug trenches, and pillboxes are backed by vast minefields with a mix of anti-tank and anti-personnel mines, according to an article by Jack Watling, a land-warfare expert at the Royal United Services Institute. A Ukrainian official told CNN that there are three to five mines per 10 square feet. There are also anti-tank ditches and miles-long rows of concrete anti-tank pyramids known as dragon’s teeth.