Harrowing footage published by Ukraine's special operations forces this week shows their troops storming a Russian trench and engaging in deadly close-quarters fighting with Moscow's soldiers. The assault appears to have caught the Russians by surprise and left several dead as the Ukrainians cleared their way through the dirt maze. In stark contrast to the reactions by the Russian soldiers, Kyiv's forces appear to have executed the mission flawlessly, doing "everything right," a former US Army infantry soldier said. "What the Ukrainians did is very unique in their level of proficiency," John Spencer, chair of urban warfare studies at West...