Ukrainian companies are increasing the production of fiber-optic drones.The drones can't be jammed with traditional electronic warfare, making them a huge threat in combat.BI spoke with several people involved in the effort to scale up production to keep pace with Russia.

It came as Russia and Ukraine swapped 150 prisoners of war each and UK foreign secretary David Lammy met with Ukrainian president Volodymyr Zelensky in Kyiv.

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.