India, March 25 -- A major Russian drone and missile attack on civilian areas of Ukraine killed four people and injured at least 27, officials said Tuesday.

Moscow's army stepped up efforts to break through Ukrainian front-line defence 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 morning as dozens of drones targeted the capital Kyiv during daylight. Russia also launched 23 cruise missiles and seven ballistic missiles at Ukraine during the night, hitting at least 10 locations across the country, according to the air force.

Ukrainian civilians have endured ...