Ukraine’s Most Potent Weapon: The Software Orchestrating Its Drone Army

The screens, showing live drone footage of the battlefield, flickered with color-coded frames: green for Russian equipment, blue for Ukrainian forces, orange when friend and foe were hard to tell apart. Then, a frame flashed red, indicating a Russian soldier sprinting along a tree line.

The Ukrainian troops watching from an underground command post on the eastern front sprang into action. A duty officer logged the Russian soldier’s coordinates into a computer. This automatically placed a diamond-shaped marker on a digital battlefield map, visible to all units in the vicinity. Within minutes, three attack drones were in the air, closing in.

The first drone missed. But the duty officer, from the Ukrainian First Separate Assault Regiment, fed the strike location and a video of the attack to drone teams from two other units so they could try to kill the Russian soldier.

This chilling sequence — detection, tracking, strike — all depended on powerful software that Ukraine has developed, called Delta.

The software pulls streams of battlefield intelligence, including drone video feeds, radio intercepts and satellite images, into a single platform that helps detect targets. The system then distributes the targets to thousands of reconnaissance and attack drones that fly around the clock, helping to create a miles-wide “kill zone” where anything that moves can be spotted and hit within seconds.

Col. Artem Martynenko, who oversees the development of the software for the Ukrainian Defense Ministry, called Delta the “nervous system” of the army of drones that have brought Russian advances to a near standstill.

Western militaries have begun to take note. Daniel Driscoll, the U.S. Army secretary, has called the software “absolutely incredible” and acknowledged that American forces were playing catch-up.

Delta’s battlefield management system “fully integrates every single drone, every sensor and every shooting platform into just one single network,” Mr. Driscoll told the Senate in May, adding, “Ours does not.”

NATO forces got an appreciation of that gap last year during an exercise in Estonia in which Ukrainian drone units decimated alliance formations in simulations.

Experts say software like Delta is the next frontier in warfare. With the battlefield already saturated with drones, victory depends less on the sheer number deployed and more on how fast they can be sent to strike. Kyiv and Moscow are competing to build the best system, with both turning to artificial intelligence to gain an edge.

Delta’s origins go back more than a decade. In 2014, a group of Ukrainian volunteers battling Russian-backed separatist forces in eastern Ukraine was experimenting with reconnaissance drones. The idea was to improve artillery targeting and replace old-fashioned tools like binoculars.

But the data that the drones collected moved too slowly. Getting the intelligence to artillery units took a chain of radio calls. By the time a target could be fired on, the objective had often vanished, said Yaroslav Honchar, a co-founder of the group, Aerorosvidka.

The group created Delta as a solution. The software began as a shared digital map on which targets could be pinpointed. NATO financed the effort, Mr. Honchar said, hoping to steer Ukraine toward the alliance’s own doctrine of rapid force coordination across the battlefield.

Still, Mr. Honchar acknowledged, the Ukrainian Army for years largely resisted adopting the system, clinging to paper maps and radio transmitters.

Then Russia invaded in early 2022.

As columns of Russian forces raced toward the Ukrainian capital, Kyiv, Mr. Honchar was called to help find their weak points. Working from a headquarters inside the nearly encircled city, he used Delta to turn a torrent of intelligence — including tips from civilians watching tanks roll past their houses — into a real-time picture of Moscow’s advance. Within days, Ukrainian counter***ault troops were striking the softer spots, forcing the Russian troops to pull back.

Delta showed how a sharper eye on the battlefield could help defeat a much larger force, Mr. Honchar said. From there, the system spread across the military, becoming Ukraine’s unified battlefield management system by last summer.

The system was on display one recent morning at the First Separate Assault Regiment’s command post, where dozens of screens gave the underground bunker the feel of an air traffic control center.

Duty officers sat behind the screens, typing data into laptops. One wore three headsets — two over his ears, one around his neck — as he coordinated units on the ground. Half-crushed energy drink cans littered the floor.

Leaning back in a gaming chair, the commander, whose call sign is Pyrotechnician, watched the scene in comfort as the machines did the onerous task of pulling all the data together. He said he remembered the days of lengthy radio exchanges. “Now, you just sit there, you have internet, you open the maps and you can see who is where and doing what,” he said. Like other soldiers interviewed, he asked to be identified only by his call sign, according to military protocol.

His unit has used Delta to process scattered sightings of Russian soldiers and equipment. The details often mean nothing on their own, but, in one instance, the software stitched the data together and revealed a hidden Russian artillery crew.

Another officer in the brigade said that one of Delta’s most useful features is the ability to track targets over time. He opened his laptop and clicked on a red diamond on the map marking a Russian howitzer. A tab appeared on the screen’s right side, showing when the howitzer was first sighted, how many times it had been attacked and by which units.

The goal is for the next unit to see that history, so it does not strike an object that is already disabled or repeat tactics that had failed. It is an old problem: U.S. troops arriving in Afghanistan often repeated the mistakes of the units before them because information had not been properly p***ed along.

By fusing reconnaissance and strike tools, Delta has also shrunk what soldiers call the kill chain — the time between spotting a target and hitting it. A battalion chief of staff in the Ukrainian Khartiia Corps said that it once took at least 20 minutes from the moment a unit reported an enemy position to the first artillery rounds being fired. Now, it’s three to five minutes.

Kateryna Bondar, a senior fellow at the Center for Strategic and International Studies in Washington, said, “The faster your kill chain, the more likely you’re to win.”

Ms. Bondar argued in a recent article that software, not drones, would shape future warfare. She said that Russia was developing an equivalent to Delta but that Ukraine retained an edge. Western militaries, she warned, need to catch up fast or risk being left behind.

A Ukrainian officer who took part in the NATO exercises in Estonia last year recalled watching military vehicles appear nonstop on Delta’s interface, just a click away from destruction.

“It was like a carnival for us,” said the officer, who uses the call sign Crow.

What helped to spot those vehicles so fast, Crow added, was the artificial intelligence that Ukraine is working to weave through Delta.

Kyiv’s forces have been training A.I. target-detection tools on millions of hours of battlefield videos collected by drones. Officials say they want A.I. embedded across Delta to help commanders make faster, data-driven decisions.

During an interview in Kyiv, Danylo Tsvok, head of the Ukrainian Defense Ministry’s A.I. center, revealed the latest product his team had developed: an A.I. ***istant called SPECTR. The interface, essentially a chatbot for the battlefield, links into Delta and other software, and can answer questions. Commanders will soon be able to test the ***istant when planning attacks.

Mr. Tsvok described the technology push as a kind of arms race. “The side that can make decisions faster will have the advantage in the war,” he said.