Recent social media videos show Ukrainian forces using drones similar to IEDs. The drones sit next to roads and then strike Russian military vehicles when they pass.

"This refinery is one of the 10 largest oil refineries in Russia in terms of design capacity and is involved in supplying the Russian occupatying army," the General Staff said in a statement.

Ukrainian soldiers are now using a long-range drone capable of traveling up to 2,000 kilometers (1,242 miles) and carrying a 250-kilogram air bomb, the Unmanned Systems Forces said on Jan. 31. The drone is described as a “unique development” and a potential game changer on the battlefield.