Ukraine’s capital Kyiv came under a large-scale Russian drone and missile attack overnight into Saturday, just hours after Russia and Ukraine began a major prisoner exchange.

Ukraine’s capital came under a large-scale Russian drone and missile attack overnight and into early Saturday that left at least 15 people injured, according to Ukrainian officials. Explosions and machine gun fire wre heard throughout Kyiv as many sought shelter in subway stations.

Overnight strikes follow days of some 800 Ukrainian attacks on targets inside Russia, including capital Moscow