Russia launches biggest drone attack on Ukraine's Kharkiv

At least three people are killed and 21 injured in Kharkiv, near the Russian border.

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Ihor Terekhov said that overnight Russia launched 48 drones, two missiles and four gliding bombs in an attack he described as "open terror".

It comes after a massive wave of drones and missiles struck across Ukraine on Thursday night. Moscow said the strikes were in response to "terrorist attacks by the Kyiv regime", following Ukraine's surprise raids on Russian air bases last Sunday.

Meanwhile, Russian and Ukrainian officials released conflicting accounts about when a prisoner swap agreed at earlier talks will take place.

Some 18 apartment buildings and 13 other homes in Kharkiv were hit overnight during Friday's attack, the city's mayor said. A baby and a 14 year-old girl were among the injured, he added.