In addition to begging the Us for more weapons (and money), Ukraine's leader is dealing with a reduction of manpower: On the global stage, Ukrainian President Volodymyr Zelensky has been consistently on message: In visits to Washington and other Western capitals, he has focused on keeping Kyiv supplied with more advanced arms, ammunition and financing. At home, however, he faces a human resources problem. The war is approaching the end of its second year, and Ukraine’s military needs more manpower to sustain a bloody war of attrition against Russia, a country with more than three times the population of Ukraine. In a recent essay, Ukraine’s top military commander, Valery Zaluzhny acknowledged that training and recruiting troops was becoming a serious challenge. “The prolonged nature of the war, limited opportunities for the rotation of soldiers on the line of contact, gaps in legislation that seem to legally evade mobilization, significantly reduce the motivation of citizens to se...