Hypersonic weapons have captured global military attention, but the science behind them is far from new. While ballistic missiles have exceeded Mach 5 since the 1960s, today’s hypersonic systems—including cruise missiles and gliding vehicles—represent a strategic leap forward. These weapons exploit gaps in existing defense systems through low-altitude, maneuverable flight paths that compress reaction time. Russia, China, India, and the United States are racing to operationalize hypersonic capabilities, reshaping modern warfare dynamics. Yet recent conflicts reveal they’re not invulnerable; Ukraine’s interception of Russian Kinzhal missiles demonstrates that advanced defense systems can counter these threats. The real strategic challenge lies in managing escalation risks and the ambiguity between conventional and nuclear delivery.