The 9S18 Kupol is a Soviet/Russian tracked target-acquisition radar for the Buk surface-to-air missile family, built to search for air targets and pass target-designation data to Buk command vehicles. Open references identify the original Tube Arm radar and later 9S18M1 Snow Drift derivatives, including the 9S18M1-2 and 9S18M1-3 radars, as surveillance elements for later Buk configurations; Ukraine war reporting has documented Russian 9S18 and 9S18M1-3 Kupol vehicles destroyed with Buk-family equipment.
Russian forces have fielded 9S18 Kupol radars with Buk-family air-defense equipment in Ukraine. Army Recognition reported a September 2023 Ukrainian strike that destroyed a Russian Buk-M1 set including a 9S18 Kupol, while Defense Express reported 2025 strikes against Russian Kupol radars, including a 9S18M1-3 radar belonging to a Buk-M3 system in the temporarily occupied Donbas.
Role detailsBuk-family sources use 9S18 for the original Kupol/Tube Arm radar and 9S18M-series designations for later Snow Drift target-acquisition vehicles.
| Variant | Configuration | Designation notes |
|---|---|---|
| 9S18M1 Kupol-M1 / Snow Drift | Buk-M1 target-acquisition radar | Air Power Australia describes the 9S18M1 Snow Drift as the revised acquisition radar introduced with Buk-M1, while open Buk composition tables list 9S18M1 as the Buk-M1 surveillance radar. Sources: 9K37 Buk M1/M2 - Air Power Australia, Buk Missile System - Wikipedia |
| 9S18M1-1 / 9S18M1-2 | Buk-M1-2 target-acquisition radar variants | GlobalSecurity lists 9S18M1-1 as a Buk-M1 modification and 9S18M1-2 as the 9S18M1 modification for the 9K37M1-2 Buk-M1-2 system; the Wikimedia image source identifies a Buk-M1-2 9S18M1-1 radar at MAKS 2005. Sources: 9S18 Kupol Tube Arm - GlobalSecurity, Buk-M1-2 9S18M1-1 Image - Wikimedia Commons |
| 9S18M1E / 9S18M1-3 | Later export or Buk-M2E-related derivative | Army Technology and Army Recognition identify 9S18M1E as a Buk-M2E detection and target-designation radar. VPK.name describes 9S18M1-3 as a target-detection radar derived from the Kupol family and intended to pass radar data to Buk-M2 command posts, while Defense Express has reported a Russian 9S18M1-3 loss with a Buk-M3 system in Ukraine. Sources: Buk-M2E Air Defence Missile System - Army Technology, Buk-M2E - Army Recognition, 9S18 Kupol Tube Arm - GlobalSecurity, 9S18M1-3 Target Detection Radar - VPK.name, Buk-M3 Radar Destroyed in Donbas - Defense Express |
The 9S18 family is a radar component rather than a missile launcher; it supports Buk batteries by searching airspace and feeding target data to command and firing vehicles.
| Compatible item | Item type | Compatibility evidence |
|---|---|---|
 | Medium-range surface-to-air missile system | Buk-family references list 9S18M-series target-acquisition radars among the surveillance or detection elements of later Buk configurations, while the cataloged Buk-M2 page covers the missile system and firing vehicles. Sources: Buk-M2E Air Defence Missile System - Army Technology, Buk-M2E - Army Recognition, 9K37 Buk M1/M2 - Air Power Australia |
 | Buk-family surface-to-air missile | The 9S18 radar does not launch missiles; it belongs to the Buk system context that used 9M38-family missiles in Buk-M1 and earlier Buk-family configurations. Sources: Buk Missile System - Wikipedia, 9K37 Buk M1/M2 - Air Power Australia |
The 9S18 Kupol family sits on the detection side of a Buk battery rather than on the firing vehicle itself. Sources describe it as a mobile three-coordinate radar that scans airspace, identifies targets, and sends target-designation data to the Buk command post, which then coordinates TELARs and launch vehicles.
Searches for aircraft and other air targets before engagement radars and launchers take over the fire-control task.
A destroyed or captured Kupol vehicle degrades a Buk unit's wide-area surveillance and target-designation capacity, even when launchers remain present.
Reports may use 9S18, 9S18M1, Kupol, Tube Arm, or Snow Drift for related radar variants; the exact vehicle variant is source-dependent.
Sources: 9S18 Kupol Tube Arm - GlobalSecurity; 9K37 Buk M1/M2 - Air Power Australia; Russian Buk-M1 Detection Radar Destroyed - Army Recognition.
Open Buk-family histories place the start of 9K37 Buk development in the early 1970s, with Tikhomirov NIIP responsible for system design.
Sources: Buk Missile System - Wikipedia, 9K37 Buk M1/M2 - Air Power Australia
Air Power Australia describes the second Buk development phase as producing the 9S470 command post, 9S18 Kupol acquisition radar, and other vehicles for the 9K37-1 Buk system, with initial operational capability in 1980.
Sources: 9K37 Buk M1/M2 - Air Power Australia
The Wikimedia Commons image record documents a Buk-M1-2 9S18M1-1 target-acquisition radar photographed at MAKS 2005 in Zhukovskiy.
Sources: Buk-M1-2 9S18M1-1 Image - Wikimedia Commons
Army Recognition reported that Ukrainian Special Forces destroyed a Russian Buk-M1 set that included a 9S18 Kupol detection radar.
Sources: Russian Buk-M1 Detection Radar Destroyed - Army Recognition
Defense Express reported that Ukrainian forces destroyed a 9S18 Kupol target-acquisition radar alongside Buk-family air-defense equipment in Luhansk region.
Sources: Kupol Radar Destroyed in Luhansk Strike - Defense Express
Defense Express reported that Ukraine's Defense Intelligence destroyed a Russian 9S18M1-3 radar station belonging to a Buk-M3 system in the temporarily occupied Donbas.
Sources: Buk-M3 Radar Destroyed in Donbas - Defense Express
