Russian missile and drone attacks on Ukraine overnight have killed at least four people and wounded 20, officials say, prompting fresh pleas from Ukraine's president for Western air defence 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.

In the Dnipropetrovsk region, two people were killed and seven wounded, ac

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