How the cable replaces the radio link
- 1 Operator
- 2 Cable on the ground
- 3 Spool on drone
The spool is on the aircraft, usually underneath or behind it. As the aircraft moves, cable pays out behind it. This is a communication tether; the US Army description does not describe a ground cable supplying propulsion power.[3]
The useful distinction is between the link and the whole aircraft. Fibre replaces the radio command-and-video path. It does not make the motors, camera or airframe indestructible. RUSI’s 2024 explanation highlights the clear video retained without radio interference.[3][14]
A sourced timeline
The Kyiv Independent identifies Knyaz Vandal Novgorodsky, also written Knyaz Vandal Novgorodskiy or KVN, as the first fibre-optic model deployed at scale, in Russia’s Kursk region in August 2024. That is a reported deployment milestone, not proof of who invented fibre control.[9]
On 2 January 2025, Ukraine’s defence ministry announced a demonstration of more than a dozen domestically made fibre-controlled drone models. It said some carried up to 3 kg. A demonstration and a stated payload are not independent evidence of fleet-wide battlefield performance.[6]
Ukraine’s ministry said it had adopted nearly 40 fibre-controlled systems by 26 April 2025 and authorised more than 80 new models by 21 August. These are official model-approval counts. They are not numbers of aircraft delivered, sorties flown or independently verified successful strikes.[1][8]
In February 2026, Ukraine’s ministry announced an upgraded Baton Optik with a strike range exceeding 30 km. That is a specific official performance claim; this review does not turn it into a guaranteed radius for other fibre-optic drones.[4]
What is established, and what is claimed?
| How to read it | Evidence and limits |
|---|---|
| Established mechanism; bounded scope | A fibre-optic FPV drone carries a spool of thin cable that unreels during flight. Commands and camera video travel along that physical connection. Radio jamming cannot drown out the optical control link, but a broken fibre can still interrupt control.[3][16] |
| Attributed party claim | Spool length is not a guaranteed operating radius. For one REBOFF configuration, Ukraine’s ministry describes an effective 8–9 km range and says pilots reserve 10–20% of the fibre for manoeuvring and weather. Read that as a configuration-specific ministry account.[13] |
| Attributed party claim | In February 2026, Ukraine’s ministry announced an upgraded Baton Optik with a strike range exceeding 30 km. That is a specific official performance claim; this review does not turn it into a guaranteed radius for other fibre-optic drones.[4] |
| Reported evidence; limits explicit | Countermeasures need detection as well as interception. NATO’s June 2025 results describe radar-based detection and tracking among the selected solutions. Radio-link resistance changes which defence layers matter, rather than eliminating the possibility of defence.[11] |
Range comes with trade-offs
There is no single fibre-drone range. A CSIS discussion described 3, 5 and 10 km cable containers; Ukraine’s defence ministry later described Khyzhak REBOFF spools of 10–20 km. These are different systems and reporting dates, not one universal specification.[5][13]
Spool length is not a guaranteed operating radius. For one REBOFF configuration, Ukraine’s ministry describes an effective 8–9 km range and says pilots reserve 10–20% of the fibre for manoeuvring and weather. Read that as a configuration-specific ministry account.[13]
A longer spool adds weight and bulk. The US Army identifies the trade-off directly: a larger, heavier spool can reduce the munition load. A record cable length therefore cannot tell you the remaining payload, endurance or practical flight profile.[3]
The physical link brings physical failure modes. Ukraine’s Army+ course includes fibre breakages among its faults. AP reports that wind or other drones can tangle the cables. Resistance to radio jamming should not be read as a promise that every launch reaches its destination.[2][16]
The cable remains in the landscape after flight. AP describes front-line footage showing towns and fields covered in shiny strands resembling fishing line. Such images demonstrate accumulated cable; they do not provide a reliable count of missions, hits or working drones.[2]
Systems and numbers: read the units
Named Ukrainian examples include Khyzhak REBOFF, TechEx’s Stalker and Hromylo Optic in defence-ministry releases. These releases document official adoption or descriptions of the systems. Their effectiveness language remains the ministry’s account rather than an independently measured comparison.[8][13][15]
The Kyiv Independent also reports the unveiling of Silkworm in late February 2025: a Ukrainian modular fibre spool intended for FPV aircraft and uncrewed ground vehicles. The same communication idea therefore appears in more than one vehicle category.[9]
Ukraine’s ministry said it had adopted nearly 40 fibre-controlled systems by 26 April 2025 and authorised more than 80 new models by 21 August. These are official model-approval counts. They are not numbers of aircraft delivered, sorties flown or independently verified successful strikes.[1][8]
What countermeasures can address
NATO’s May 2025 innovation call explicitly sought ways to detect, intercept or neutralise fibre-optic drones. The call establishes a development requirement. It does not establish that every proposed countermeasure works, or that a finished defence was already widely deployed.[12]
Countermeasures need detection as well as interception. NATO’s June 2025 results describe radar-based detection and tracking among the selected solutions. Radio-link resistance changes which defence layers matter, rather than eliminating the possibility of defence.[11]
A US Marine Corps report describes a January 2026 evaluation of fibre-optic FPV systems with the Defense Innovation Unit. This is evidence of official testing outside the Russia–Ukraine war, not a declaration of operational adoption or a published comparative success rate.[10]
What we do not know
Questions left open by this source review:
- What is the independently measured failure rate for each spool and aircraft combination?
- How many approved models were actually delivered and used, over which period?
- Which cable-length records have independently documented payload, weather and flight path?
- What are the long-term environmental effects and practical options for recovering abandoned fibre?
US Marines: controlled fibre-optic drone evaluationWatch at the source · US Marine Corps / DVIDS ↗Frequently asked questions
How do fibre-optic drones work?
A fibre-optic FPV drone carries a spool of thin cable that unreels during flight. Commands and camera video travel along that physical connection. Radio jamming cannot drown out the optical control link, but a broken fibre can still interrupt control.[3][16]
Can fibre-optic drones be jammed?
The useful distinction is between the link and the whole aircraft. Fibre replaces the radio command-and-video path. It does not make the motors, camera or airframe indestructible. RUSI’s 2024 explanation highlights the clear video retained without radio interference.[3][14]
The physical link brings physical failure modes. Ukraine’s Army+ course includes fibre breakages among its faults. AP reports that wind or other drones can tangle the cables. Resistance to radio jamming should not be read as a promise that every launch reaches its destination.[2][16]
How far can a fibre-optic drone fly?
Spool length is not a guaranteed operating radius. For one REBOFF configuration, Ukraine’s ministry describes an effective 8–9 km range and says pilots reserve 10–20% of the fibre for manoeuvring and weather. Read that as a configuration-specific ministry account.[13]
In February 2026, Ukraine’s ministry announced an upgraded Baton Optik with a strike range exceeding 30 km. That is a specific official performance claim; this review does not turn it into a guaranteed radius for other fibre-optic drones.[4]
Is the cable spool on the drone or on the ground?
The spool is on the aircraft, usually underneath or behind it. As the aircraft moves, cable pays out behind it. This is a communication tether; the US Army description does not describe a ground cable supplying propulsion power.[3]
Which side first used fibre-optic drones in Kursk?
The Kyiv Independent identifies Knyaz Vandal Novgorodsky, also written Knyaz Vandal Novgorodskiy or KVN, as the first fibre-optic model deployed at scale, in Russia’s Kursk region in August 2024. That is a reported deployment milestone, not proof of who invented fibre control.[9]
Why are fields covered in drone cables?
The cable remains in the landscape after flight. AP describes front-line footage showing towns and fields covered in shiny strands resembling fishing line. Such images demonstrate accumulated cable; they do not provide a reliable count of missions, hits or working drones.[2]
Can fibre-optic drones be stopped?
Countermeasures need detection as well as interception. NATO’s June 2025 results describe radar-based detection and tracking among the selected solutions. Radio-link resistance changes which defence layers matter, rather than eliminating the possibility of defence.[11]
Sources and exact excerpts
Short excerpts show what a source says; they do not independently verify its claims. Dates retain the precision available in the source. AI-assisted source reading and drafting; no independent performance testing.
- Ministry of Defence of Ukraine ↗
authorized more than 80 new models of unmanned aerial systems with a fiber-optic control channel
- Associated Press ↗
The drones are not infallible because the wind - or other drones - can cause the cables to tangle.
coated with shiny, fishing line-like strings
- US Army · Center for Army Lessons Learned ↗
Both video and command signals pass over the fiber optic cable
larger and heavier spools can significantly reduce munition load
- Ministry of Defence of Ukraine ↗
The Defence Forces’ arsenal has been reinforced with fiber-optic-controlled FPV drones featuring a strike range exceeding 30 km.
- CSIS ↗
a receptacle that can hold a fiber optic cable for up to three kilometers, five kilometers
even up to 10 kilometers
- Ministry of Defence of Ukraine ↗
several domestic manufacturers showcased over a dozen models of drones, with some capable of carrying payloads of up to 3 kg
- US Marine Corps / DVIDS ↗
evaluated fiber-optic drones for use in signal-degraded environments
- Ministry of Defence of Ukraine ↗
has codified and adopted nearly 40 unmanned aerial systems with fiber-optic control
‘Hromylo Optic’ unmanned aerial system
- The Kyiv Independent ↗
Kursk Oblast in August 2024
The first fiber optic drone model deployed at scale to the front line was the Knyaz Vandal Novgorodsky
- US Marine Corps ↗
Jan. 27-29, 2026, to evaluate first-person view small unmanned aircraft systems that use fiber optic cables
- NATO Allied Command Transformation ↗
KMB delivered a modular radar solution that enables cost-effective detection and tracking of small, low-signature aerial threats.
- NATO Allied Command Transformation ↗
Existing or potential solutions that can DETECT, INTERCEPT, or NEUTRALIZE a Fiber Optic Drone are particularly interesting.
- Ministry of Defence of Ukraine ↗
These drones are equipped with fiber-optic spools measuring 10 to 20
pilots typically reserve 10–20% of the fiber-optic cable
- RUSI ↗
the cables provide a high-quality video back to the operator that doesn’t fuzz out when there is interference
- Ministry of Defence of Ukraine ↗
Included among them is the Stalker drone series by Ukraine’s TechEx, equipped with fiber-optic control.
- Ministry of Defence of Ukraine ↗
Typical faults and troubleshooting (including missing video, control issues, and fiber breakages)