Ukraine's capital Kyiv is again under a massive overnight Russian drone attack, local officials say, with at least eight people reported injured and fires burning across the city. Authorities in Kyiv say drone wreckage has hit the roof of a residential building in the central Shevchenkivskyi district.

The latest Russian barrage comes amid escalating aerial cross-border attacks by Moscow. June saw a new monthly record for the number of long-range drones and missiles launched into Ukraine -- 5,438 drones and 239 missiles -- according to figures published by the Ukrainian air force.

Ukraine said it struck a Russian air base on Saturday, while Russia continued to attack Ukraine with hundreds of drones overnight as 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.