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.

Hundreds of Ukrainian drones hit Russia during Kyiv’s biggest-ever attack on Moscow. The Russian Defense Ministry announced it intercepted 337 drones during the Ukrainian attack early on Tuesday morning,

The Ukrainian military said on Wednesday that Russia launched three missiles and 133 drones in an overnight attack. It said the air force shot down 98 drones. Another 20 drones did not reach their targets,