Small, maneuverable and impossible to jam, Russia’s best fiber-optic drones can—in the hands of skilled operators—slip into the buildings and dugouts sheltering Ukrainian vehicles. A video circulated by Russian sources on or before Monday depicts a warhead-laden quadcopter drone easing under a tarp and into a barn where a Ukrainian Bohdana wheeled howitzer was parked.

Over the past 24 hours, on March 10, the Ukrainian Defense Forces eliminated about 1,300 more Russian troops and dozens of armored combat vehicles, according to the General Staff of the Armed Forces of Ukraine.

The Ukrainian air force said it shot down the ballistic Iskander-M missile and 79 of the drones, while another 35 drones did not reach their targets likely due to electronic warfare countermeasures. In the southern region of Odesa,