Ukraine's Impending Counteroffensive Against Russia Raises Concerns.

Ukraine is preparing for a spring counteroffensive against Russia, likely in the south, where Russian defenses have been built up with anti-tank ditches, obstacles, minefields, and trenches. Breaking through will be a huge challenge for the Ukrainians, who will need to bypass or overcome such obstacles at speed to create momentum that causes Russian command and control to melt down. The Ukrainians will need to disrupt supply lines, destroy ammunition depots, and hit fuel infrastructure ahead of the offensive to make sustaining defending troops harder.