Dozens of damaged military vehicles with Russian markings could be seen scattered chaotically across a snow-covered field in footage released last week of a battlefield near the eastern Ukrainian mining town of Vuhledar, southwest of the Russian-held city of Donetsk. The hulls of some of the armored vehicles were covered in black soot from what appeared to be recent fires. Lying nearby were tank turrets and other parts from combat vehicles that had been dismembered by explosions. Next to the burned-out vehicles, the drone footage clearly showed the dead bodies of what appeared to be Russian soldiers. The intense fighting...