When Russia invaded Ukraine in February, the Kremlin inadvertently put its military forces in an unsustainable position, ordering them to take on more operations than they could bear. It had nearly all its soldiers surge simultaneously and rapidly into Ukraine to fight along multiple fronts. It did so without taking necessary protective measures, such as clearing routes of explosives. It had its forces advance at an unsustainable pace. As a result, Russian troops were vulnerable to ambushes, counterattacks, and severe logistical problems that cost the military enormous numbers of soldiers and equipment. That initial error was caused by the Kremlin’s...