Kyiv (CNN) — Russia launched waves of drones and ballistic missiles at multiple targets across a broad swath of Ukraine early Friday, killing at least four people in the capital and wounding around 40 across the country.

A CNN producer in the Kyiv region reported hearing at least two explosions in the pre-dawn hours and images from the capital showed flames rising over apartment buildings and firefighting crews at work.

As daylight broke, residents picked through debris in damaged apartments, with images showing entire walls ripped away and windows shattered. Several cars parked in the streets below were covered with pieces of glass and masonry.

Ukraine is hit by nightly barrages of Russian drones and missiles. But the country has been bracing for a major retaliatory strike promised by

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