New Delhi, March 25 -- A major Russian drone and missile attack on civilian areas of Ukraine killed six people and injured at least 46, officials said Tuesday, while Moscow's army stepped up efforts to break through Ukrainian front-line defenses in what could be the start of an anticipated spring ground offensive.

Russia fired almost 400 long-range drones at Ukraine overnight, Ukraine's air force said, in its biggest attack in weeks. The onslaught continued into Tuesday as dozens of drones targeted the capital Kyiv during daylight.

Russia launched swarms of Iranian-designed Shahed drones, hitting at least seven cities, Ukrainian Foreign Minister Andrii Sybiha said on X.

Russia also launched 23 cruise missiles and seven ballistic missil...