Russian missile and drone attacks on Ukraine overnight into Saturday killed at least four people and wounded 20, officials said, and prompted fresh pleas from Ukraine's president for additional Western air defense systems.

In the capital, Kyiv, two people were killed and 13 were wounded in a ballistic missile attack in the early hours of Saturday, Kyiv's police said.

A fire broke out in a non-residential building in one location, while debris from intercepted missiles fell in an open area at another site, damaging windows in nearby buildings, Ukraine's State Emergency Service wrote on the message app Telegram.

"Explosions in the capital. The city is under ballistic attack," Mayor Vitali Klitschko wrote on Telegram during the onslaught.

A firefighter works to extinguish a fire at a wa

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