VLADIMIR Putin launched a massive blitz targeting Ukraine’s capital city Kyiv in one of the war’s heaviest airstrikes.

At least 14 people were injured in one of the biggest combined drone and ballistic missile attacks to date.

A fire broke out in apartments on the third and fourth floors of a five-storey residential building in the Solomianskyi district.

The debris of intercepted missiles and drones fell in at least four city districts of the Ukrainian capital early Saturday, said acting head of Kyiv military administration Tymur Tkachenko.

According to Tkachenko, six people required medical care after the attack, and two fires were sparked in the Solomianskyi district of Kyiv.

The State Emergency Service said: “Information on possible casualties is being confirmed.”

The air blitz came just hours after Russia and Ukraine began a major prisoner exchange, swapping hundreds of soldiers and civilians.