Ukraine may be cracking Russia's frontlines, but now it has to get Russian troops to crack as well

• Ukraine's counteroffensive has begun piercing Russia's defensive lines.
• But Russian troops have been fighting fiercely trenches behind extensive obstacles and minefields.
• To really break through, Ukraine will have to get the Russians out of their trenches and on the run.

Ukraine's counteroffensive is slowly piercing Russian defenses, at great cost in casualties and time. But if Kyiv wants to avoid a grind in which a successful attack is limited to capturing an obscure village or taking a few hundred yards of territory, it has to get the Russian army on the move.