A display of a white drone and monitoring aircraft.
The Lancet drone, left, on display at a military forum hosted in Russia.
  • The US imposed sanctions against Russian manufacturer Zala Aero, which produces the Lancet drones.
  • The Lancet drone is a loitering munition that stays near its target before crashing into it.
  • The vehicle is small and lightweight — and effective against Ukraine's advances.

The US imposed sanctions on Thursday against a Russian manufacturer of lightweight drones that has been impeding the progress of Ukraine's counteroffensive.