Officials say a massive Russian attack of drones and missiles targeted the Ukrainian capital and other regions early Sunday in the country for a second consecutive night, killing at least 12 people and injuring dozens.

Russian drones and missiles again bombarded cities across Ukraine on Saturday night into Sunday morning despite the completion of the largest prisoner exchange of the 3-year-old war. The Armed Forces Operational Command in Poland -- a NATO nation that borders Ukraine to the west -- said in a Sunday morning post to X that its fighter jets were scrambled during the Russian attack.

Russia and Ukraine swapped hundreds more prisoners on Sunday, the third and last part of a major exchange that reflected a rare moment of cooperation in otherwise failed efforts to reach a ceasefire in the more than three years of war.

The massive missile and drone attack across Ukraine followed large strikes the night before, and casts more doubt on the U.S.-brokered peace process.

Unjammable, lethal, and accurate, fibre-optic tethered drones are revolutionizing the battlefield — and giving Moscow an advantage.