The Russia-Ukraine war has entered a dangerous new phase after one of the deadliest Russian attacks on Kyiv in recent months left at least 27 people dead and pushed both sides toward fresh military escalation. Ukraine says Russia launched one of its largest overnight aerial assaults since the war began, firing hundreds of drones and dozens of missiles at targets across the country. The attack heavily damaged residential buildings in Kyiv, killing civilians and forcing tens of thousands of residents, including thousands of children, into underground shelters as air raid sirens echoed across the capital. President Volodymyr Zelenskyy condemned the assault and vowed that Russia would face certain retaliation. Kyiv is also seeking US approval to expand domestic production of Patriot missile systems while European allies prepare additional sanctions against Moscow. Russia, meanwhile, claimed the massive barrage was carried out in response to recent Ukrainian drone attacks inside Russian territory. Moscow also reported intercepting hundreds of Ukrainian drones over recent days and accused Kyiv of escalating cross-border attacks. WATCH