As snow fell in a wooded area of Ukraine, the long-range attack drones accelerated one by one down an unlit, abandoned road and their whirring engines propelled them into the night sky.

Videos showed fireballs over a facility in Ryazan, 110 miles southeast of Moscow. Kyiv is seeking to disrupt Russian military logistics and put pressure on the country’s economy by striking its oil industry.

Ukraine has intensified missile and drone strikes on Russia. Russian air defenses are stretched, prompting efforts to find other approaches to protect domestic targets.

Officials in Ukraine say Russia launched a barrage of drones in an overnight attack Friday, killing at least two civilians, wounding several others and damaging commercial and residential buildings. The Interior Ministry said two victims were killed by drone debris in the central Kyiv region.

Russian troops attacked Ukraine with 58 Shahed attack UAVs and decoy drones on the night of 23-24 January. The Ukrainian air defence forces have managed to destroy 25 drones and 27 disappeared from radar.