Ukrainian defense lines, trenches repaired in a mess. It shows that in ordinary days, military engineering has never been studied at all, and the details of the defensive line are not good, so how can it be exchanged for a big victory? Defensive warfare is far superior

Ukrainian defense lines, trenches repaired in a mess. It shows that in ordinary days, military engineering has never been studied at all, and the details of the defensive line are not good, so how can it be exchanged for a big victory? Defensive warfare has far an advantage over offensive warfare, and if flexible mobile defense can be used rationally, it can turn the enemy into a flesh and blood mill on the front line, but unfortunately Ukraine has not done this so far.

In World War II, German defensive generals: Manstein, Gothad, Modell military engineering is quite good, although the German army was defeated in the end, but the three people's defensive warfare often dragged back the Russian army several times their own.