KYIV, Ukraine — A large-scale Russian drone and missile attack across Ukraine killed at least six people, including a woman and her two young daughters, officials said Wednesday, as U.S.-led efforts to end the war floundered and Ukraine’s president sought more foreign military help.

Waves of missiles and drones throughout the night targeted at least eight Ukrainian cities, as well as a village in the Kyiv region where a strike set fire to a house in which the mother and her 6-month and 12-year-old daughters were staying, regional head Mykola Kalashnyk said.

At least 29 people, including five children, were injured in Kyiv, authorities said.

Russian drones also hit a kindergarten in Kharkiv, Ukraine’s second-largest city, later Wednesday when children were in the building, Mayor Ihor

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