Ammon News - Russia attacked Ukraine's capital Kyiv early on Saturday with drones and missiles, triggering fires, strewing debris in districts throughout the city and injuring at least eight people, the city's mayor said.

Reuters witnesses saw and heard successive waves of drones flying over Kyiv, and a series of explosions jolted the city.

An air alert remained in effect more than two hours after it was first declared.

The overnight strikes followed several days of Ukrainian drone attacks - some 800 attacks - on targets inside Russia, including capital Moscow.

Russian Foreign Minister Sergei Lavrov had vowed on Friday to respond to those attacks. Reuters