A combined Russian missile and drone attack on Ukraine overnight killed at least 15 people — including an American citizen — and wounded scores of others, according to Ukrainian officials.

It was the deadliest attack on the Ukrainian capital in almost a year, and came as Moscow has intensified air assaults on the city.

Russia launched a barrage of hundreds of drones and missiles on Kyiv overnight, killing more than 20 people in one of its biggest attacks on the Ukrainian capital.