KYIV, Ukraine, May 24, 2025 (BSS/AFP) - Kyiv was on alert early Saturday for a Russian drone and missile attack, the Ukrainian capital's mayor Vitali Klitschko said, after AFP journalists heard explosions.

"Explosions in the capital. Air defences have been activated. The city and the region are under a combined enemy attack," he wrote on Telegram.

At least eight people were wounded in the "massive" attack, Klitschko said, adding that two victims had been hospitalised and the others were being treated at the scene.

The Ukrainian Air Force warned ballistic missiles were heading towards the capital.

The head of the capital's civil and military administration, Tymur Tkachenko, reported two fires in the Sviatochynskyi district, missile debris falling in the Obolonskyi district, and drone debris falling on a residential building in the Solomianskyi district.

Russian missiles killed two people and wounded several others in the Ukrainian port city of Odessa on Friday, according to authorities.

The Russian military said Ukraine had targeted it with 788 drones and missiles since Tuesday, 776 of which had been shot down.

The attacks came after Ukraine and Russia began a major prisoner exchange Friday, which if completed would be the biggest swap since Moscow invaded its neighbour more than three years ago.

Both sides received 390 people in the first stage and are expected to exchange 1,000 each in total under an agreement reached at direct talks in Istanbul last week.

Russia has signalled it will send Ukraine its terms for a peace settlement after the swap, which is set to be staggered over three days.