From their base near Kupyansk, a team of Ukrainian drone pilots is locked in a high-stakes aerial battle.
They're using inexpensive drones to try to take out Russian unmanned aircraft before they can strike.
One pilot who goes by the call sign Raymond zeroes in on a Russian-made Supercam drone, which isn't equipped to observe an attack from the rear.
"It can't see you. It doesn't realize it's about to die," Raymond says.
Drones are central to Ukraine's defense operations as Russia continues its offensive across hundreds of kilometers of front lines.
Operators modify their unmanned craft with explosives to destroy the Russian reconnaissance and attack drones in flight.
It's a cost-effective strategy, Raymond says.
"Every downed drone is a real loss for them," he said. "A Supercam drone is said to cost $400,000. A drone that intercepts it costs about $1,000."
On April 10, Ukrainian officials issued a new warning about the dangers of Russian drones. The Interior Ministry stated that Russian forces have started using drones to scatter explosive devices across Ukrainian territory.
Meanwhile, Ukraine's European allies promised on April 11 to supply hundreds of thousands of military drones to Ukraine.
The United Kingdom and Norway unveiled an aid package that will direct some $580 million in military support toward unmanned aircraft, along with anti-tanks mines and repairs to military vehicles.
