What happens when interceptor missiles run out? The growing shortage is causing panic in Ukraine and elsewhere

Residents of Kyiv are sleeping once again in overcrowded metro stations or in cars in underground garages. Above, the air war is turning into a turkey-shoot. Russia is bombarding the city with ever more ballistic and hypersonic missiles. Ukraine, which had previously thwarted most such attacks with Patriot anti-missile batteries, is “going Winchester”—military jargon for running out of ammunition. Ukraine’s plight is the most acute sign of the West’s shortage of interceptors. America’s depleted arsenal also helps explain why President Donald Trump has repeatedly retreated from threats to return to war with Iran. America’s allies are alarmed. Switzerland expects its...