Alex Babenko/AP via CNN Newsource

By Kosta Gak, Eve Brennan and Simone McCarthy

(CNN) — Russia launched its largest aerial assault of its three-year war on Ukraine overnight, targeting the capital and other regions with missiles and drones for a second night in a row, even as the two sides wrapped up a major prisoner exchange.

At least 12 people were killed across Ukraine, including children, officials said. Dozens more people were injured.

Russia has been intensifying its aerial bombardment of Ukraine as international pressure mounts on Russian President Vladimir Putin to accept a ceasefire proposal.

The assault overnight into Sunday came despite the largest prisoner swap of the war taking place, a rare moment of cooperation in a brutal conflict that shows little sign of ending.

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