Russia launched a massive attack on Ukraine overnight into Saturday with hundreds of drones, killing at least one person, part of a stepped-up bombing campaign that has dashed hopes for a breakthrough in efforts to end the more than 3-year-old war.

Under a scheme first trialled last year and dubbed "Army of Drones: Bonus" (also known as "e-points"), units can earn points for each Russian soldier killed or piece of equipment destroyed. And like a killstreak in Call of Duty, or a 1970s TV game show, points mean prizes.

KYIV (Reuters) -Ukrainian President Volodymyr Zelenskiy said on Saturday that Russia launched over 30 missiles and 300 drones in an overnight attack. The attack damaged critical infrastructure in Sumy, where several thousand families suffered power cuts, he added in a statement on the Telegram messaging app.