- Russia's extensive defenses are forcing Ukraine to clear a path 10 miles wide for full-scale attack.
- Ukraine needs the space to protect its Western-made tanks and vehicles, The Wall Street Journal reported.
- Troops appeared to have pushed into Russia's main defensive line southeast near Zaporizhzhia.
Ukraine faces a daunting challenge in its counteroffensive as it pushes through Russia's defenses and clears a path to get its troops behind the front.