Russia has been burning through equipment, ammunition and weaponry at rates that have raised questions about how effectively and for how long it can continue to prosecute its war against Ukraine. The challenge of sustaining the military effort isn’t unique to Russia, which after making significant territorial gains early in the war has been yielding territory back to Ukraine in phases. Both sides have suffered heavy losses of men and materiel since the invasion began in February, but Moscow is more dependent on its own shrinking economy to replenish supplies than Kyiv is. Ukraine’s economy has been more devastated than...