On May 24, 2026, Russia conducted one of the largest combined drone and missile assaults on Kyiv and surrounding areas since the start of the full-scale invasion, incorporating hundreds of Geran-2 drones, Iskander, Kalibr, Kh-101, and Zircon systems alongside at least one Oreshnik intermediate-range ballistic missile (IRBM). Ukrainian President Volodymyr Zelenskyy confirmed the Oreshnik strike hit Bila Tserkva in the Kyiv region, marking the third documented combat use of the nuclear-capable hypersonic system following prior strikes on Dnipro in November 2024 and Lviv Oblast in January 2026. Russian Defense Ministry statements corroborated the deployment of the Oreshnik as part of retaliatory strikes on military and industrial targets, describing the barrage as a response to Ukrainian attacks on civilian sites in Russian territory. The attack killed at least two to four people, injured dozens more, and caused significant damage to residential buildings and infrastructure, with videos showing multiple bright, fast-descending objects consistent with the Oreshnik's multiple independently targetable reentry vehicle (MIRV) payload. Beyond the immediate tactical saturation effect—overwhelming Ukrainian air defenses with mixed hypersonic, ballistic, cruise, and drone threats—this repeated use of the Oreshnik, which travels at speeds exceeding Mach 10 and is designed to evade systems like Patriot, carries deeper strategic weight. As a post-INF Treaty weapon (following the 2019 U.S. withdrawal), the Oreshnik represents Russia's fielding of previously restricted intermediate-range nuclear delivery systems in a conventional conflict. This blurs escalation thresholds and serves as a live demonstration to global audiences, including NATO partners and potential adversaries like China or Iran, of operational hypersonic MIRV technology. Analysts note connections to broader proliferation dynamics: the weapon, while based on earlier RS-26 designs rather than revolutionary breakthroughs, normalizes the integration of nuclear-capable platforms into regional warfare, potentially accelerating development programs elsewhere as nations seek comparable defenses-piercing capabilities. Zelenskyy warned that tolerating such use sets dangerous precedents for 'hatred-based regimes,' urging preventive international pressure on Moscow rather than reactive measures. The strike follows Putin's public vows of revenge for a Ukrainian drone incident in Luhansk, underscoring reflexive escalation patterns that link battlefield actions to nuclear signaling.