Armored Vehicles

PRP-4 Nard / PRP-4M Deyteriy

Also known as
  • PRP-4
  • PRP-4M
  • Nard
  • Deyteriy
  • Deuteriy
  • Deyterium
  • 1V121
  • 1V125
  • 1V145
  • Object 779
  • Object 779M
  • Podvizhny Razvedyvatelny Punkt PRP-4

The PRP-4 Nard and PRP-4M Deyteriy are BMP-1-derived Soviet artillery reconnaissance vehicles built to find targets, determine coordinates, and support artillery fire direction from a protected tracked platform. The family trades the BMP-1 infantry role for radar, optical, night-vision, navigation, data-link, and laser ranging equipment, with later PRP-4A Argus vehicles continuing the same artillery-observation line in Russian service.

PRP-4 Nard / PRP-4M Deyteriy, Artillery reconnaissance vehicle, Armored Vehicles
Image source: Wikimedia Commons PRP-4M 1

Role in Conflicts

Profile / Specs

Profile

Origin
Soviet Union / Russia
Type
Artillery reconnaissance vehicle
Service note
Late Cold War and post-Soviet service
Designer
Rubtsovsk Machine-Building Plant
Designed
PRP-4 development began in 1980; PRP-4 accepted in 1984; PRP-4M modernization appeared in 1988
Produced
PRP-4 serial production from the mid-1980s at Rubtsovsk Machine-Building Plant; PRP-4M followed from 1988; PRP-4MU and PRP-4A were later upgrades or follow-ons with limited public production evidence

Specifications

Crew
5 on PRP-4, PRP-4M, and PRP-4MU in detailed PRP-family comparison data; PRP-4A references commonly list a crew of 4
Chassis
BMP-1-derived tracked amphibious chassis for PRP-4 and PRP-4M; PRP-4A chassis reporting is inconsistent between open sources
Combat weight
PRP-4: about 13,200 kg; PRP-4M/PRP-4MU: about 13,150 kg; PRP-4A: 13,800 kg in PRP-4A references
Engine and mobility
UTD-20-family 300 hp diesel; 65 km/h road speed; about 7 km/h swimming speed; 550-600 km fuel range depending on variant
Armament
One 7.62 mm PKT or PKTM machine gun for self-defense, with 1,000 rounds listed for PRP-4/PRP-4M/PRP-4MU
Protection
BMP-family welded armored hull with about 6-26 mm armor cited for PRP-4/PRP-4M/PRP-4MU; later Argus references add camouflage, smoke, and protection aids
Sensors
PRP-4/PRP-4M equipment includes PSNR-5K/1RL133-1 Kredo battlefield-surveillance radar, optical/night observation devices, laser rangefinders, navigation equipment, and artillery command/data-transmission equipment depending on variant
PRP-4M detection and targeting
Technical comparison data lists PRP-4M target recognition up to 3,000 m by day or night, tank-type radar detection up to 12,000 m, target fixing up to 10,000 m, and equipment readiness within 5 minutes
PRP-4MU distinction
PRP-4MU is described as replacing the PRP-4/PRP-4M 1RL133-1 radar with the 1RL133-3 radar
PRP-4A Argus distinction
Later Argus references describe thermal imaging, laser rangefinding, radar, range-gated imaging, optoelectronic suppression, smoke equipment, and faster readiness than PRP-4M
Reconnaissance Fit

The PRP-4 family replaced the BMP-1's infantry-carrying role with an artillery observation package. Open references describe radar, optical and night-vision devices, navigation aids, data-transmission equipment, laser rangefinders, and a small defensive machine gun as the core of the vehicle's battlefield role.

Battlefield role

Locate ground targets, determine coordinates, and help artillery units correct or direct fire from a tracked armored observation post.

Vehicle lineage

BMP-1-derived hull with specialist reconnaissance systems instead of the standard infantry fighting vehicle mission package; Rubtsovsk records and reference sources tie PRP modernization work to the same tracked-vehicle industrial line.

Designation caution

PRP-4 Nard is most often identified as 1V121, PRP-4M Deyteriy as 1V145, and Ukraine-war loss trackers as 1V125/145 PRP-4(M).

Variants

The family uses both GRAU-style equipment indexes and factory/object names: PRP-4 Nard is identified as 1V121/Object 779, PRP-4M Deyteriy as 1V145/Object 779M, PRP-4A Argus as 1V166, while Ukraine-war loss trackers often group observed vehicles under the 1V125/145 PRP-4(M) label.

VariantConfigurationDesignation notes
PRP-4MULate PRP-4M upgrade

Described as a late-1990s improved PRP-4M standard that replaced the 1RL133-1 radar with 1RL133-3; open sources suggest upgrades may have been applied during overhaul rather than large new-build production.

Sources: Armforc PRP-4 Nard and PRP-4M Deyteriy

PRP-4A ArgusLater Russian follow-on

Identified as 1V166 and associated with Rubtsovsk/Uralvagonzavod; sources describe improved reconnaissance and observation equipment, thermal imaging, optoelectronic suppression, and Russian district-service introduction as a replacement for older PRP-4 vehicles.

Sources: Army Recognition PRP-4A Argus, VPK TSAMTO PRP-4A Demonstration, Voprosy Oboronnoy Tekhniki Fire-Control Vehicles

Vehicle Family

The PRP-4 family is a specialist artillery-observation branch of the BMP-1 tracked vehicle family rather than a troop-carrying infantry fighting vehicle.

Compatible itemItem typeCompatibility evidence
BMP-1, Infantry fighting vehicle, Armored VehiclesBMP-1Base tracked vehicle family

Army Recognition describes the PRP-4A Argus as BMP-1-based, and reference material groups PRP-4/PRP-4M among BMP-1-derived specialist variants.

Sources: Army Recognition PRP-4A Argus, List of BMP-1 variants

Timeline

PRP-4 Nard / PRP-4M Deyteriy Key Events

  1. PRP-4 enters Soviet service

    Armforc describes PRP-4 Nard development beginning in 1980 as a deep modernization of the PRP-3, with acceptance in 1984 as the 1V121 PRP-4 Nard.

    Sources: Armforc PRP-4 Nard and PRP-4M Deyteriy

  2. PRP-4M modernization appears

    Armforc identifies PRP-4M Deyteriy/Object 779M/1V145 as a 1988 modernization with improved radar, optical reconnaissance, and communications equipment.

    Sources: Armforc PRP-4 Nard and PRP-4M Deyteriy, Soviet GRAU Index Archive

  3. PRP-4A Argus reported in Russian district service

    Army Recognition reported Russian Central and Southern Military District artillery units mastering PRP-4A Argus vehicles as replacements for legacy PRP-4 Nard fire-control vehicles.

    Sources: Army Recognition PRP-4A Argus

  4. Central Military District demonstrates PRP-4A Argus

    TSAMTO reporting republished by VPK.name said a PRP-4A Argus was shown to Central Military District artillery commanders and described the vehicle's thermal imaging, target search, and fire-support role.

    Sources: VPK TSAMTO PRP-4A Demonstration

  5. Russian PRP-4(M) losses tracked in Ukraine

    Oryx's full-scale invasion loss list separately records Russian 1V125/145 PRP-4(M) Nard/Deyteriy artillery reconnaissance vehicle losses and a PRP-4A Argus captured item.

    Sources: Oryx Russian Equipment Losses

  6. Two PRP-4 vehicles reported destroyed near Myrnohrad

    UNITED24 Media reported that Ukraine's 503rd Separate Marine Battalion published video from a failed Russian assault near Myrnohrad in which two PRP-4 reconnaissance vehicles were destroyed; WarSpotting records two Russian PRP-4(M) losses at nearby Razine on 5 November 2025.

    Sources: UNITED24 Myrnohrad PRP-4 Losses, WarSpotting PRP-4M 40578, WarSpotting PRP-4M 40579

  7. WarSpotting records a destroyed PRP-4(M)

    WarSpotting entry #43094 identifies a destroyed Russian 1V125/145 PRP-4(M) Nard/Deyteriy artillery reconnaissance vehicle on 25 February 2026.

    Sources: WarSpotting PRP-4M 43094

Media

PRP-4 Nard / PRP-4M Deyteriy Images

PRP-4 Nard / PRP-4M Deyteriy, Artillery reconnaissance vehicle, Armored Vehicles - view 1
Source: Wikimedia Commons PRP-4M 2
PRP-4 Nard / PRP-4M Deyteriy, Artillery reconnaissance vehicle, Armored Vehicles - view 2
Source: Wikimedia Commons PRP-4M 3
PRP-4 Nard / PRP-4M Deyteriy, Artillery reconnaissance vehicle, Armored Vehicles - view 3
Source: Wikimedia Commons PRP-4A Argus 514
Related Weapon Systems
1L13-3 Nebo-SV, Mobile VHF two-coordinate air-surveillance radar, Air DefenseAir Defense1L13-3 Nebo-SVMobile VHF two-coordinate air-surveillance radarThe 1L13-3 Nebo-SV is a Soviet/Russian mobile meter-band radar for ground-forces air defense, built to search for aircraft, helicopters, UAVs, and other air targets and pass range-and-bearing data to command posts or missile batteries. It is a two-coordinate predecessor to the 1L119 Nebo-SVU: sources describe it with a 72-element VHF antenna array, separate IFF interrogator, six-person crew, and fighter-target detection figures reaching roughly 350 km at high altitude.
1RL239/1RL239M ARK-1/ARK-1M Rys counter-battery radar, Tracked artillery-locating counter-battery radar, Electronic WarfareElectronic Warfare1RL239/1RL239M ARK-1/ARK-1M Rys counter-battery radarTracked artillery-locating counter-battery radarThe 1RL239/1RL239M ARK-1/ARK-1M Rys is a Soviet tracked artillery-locating radar family on the MT-LBu chassis, built to detect mortar, artillery, rocket-artillery, and tactical-missile firing positions for counter-battery work. The baseline ARK-1 entered Soviet service as the 1RL239, while the ARK-1M modernization added independent power and updated command equipment before late-Soviet production ended.
1V1003 command-observation vehicle, Artillery command-observation vehicle, Support EquipmentSupport Equipment1V1003 command-observation vehicleArtillery command-observation vehicleThe 1V1003 is the BTR-80-based command-observation vehicle in Russia's 1V198 Kanonada automated artillery fire-control system, used to help detect targets and automate fire missions for artillery batteries. Rostec says the 1V198 package was developed and produced by VNII Signal and includes 1V1003 vehicles with 1V1004 command-staff vehicles; open-source loss tracking and Ukrainian reporting documented at least one Russian 1V1003 captured during the 2022 phase of the Russia-Ukraine War.
1V119 Reostat, Airborne artillery reconnaissance and fire-control vehicle, Support EquipmentSupport Equipment1V119 ReostatAirborne artillery reconnaissance and fire-control vehicleThe 1V119 Reostat is a Soviet airborne, amphibious tracked artillery reconnaissance and fire-control vehicle based on the BTR-D chassis. Developed in the late 1970s for Soviet airborne artillery units, it combined observation, navigation, communications, and ballistic fire-control equipment to support self-propelled artillery formations, especially 2S9 Nona batteries. OSCE monitoring and Ukrainian reporting document Ukrainian 1V119s in the Donbas phase of the 2014 Russia-Ukraine War, while visual-loss records and defense reporting document Russian examples destroyed or captured after the 2022 full-scale invasion.
1V14 battery command and forward observer vehicle, Artillery battery command and forward observer vehicle, Support EquipmentSupport Equipment1V14 battery command and forward observer vehicleArtillery battery command and forward observer vehicleThe 1V14 is the battery commander's mobile observation and fire-control vehicle in the Soviet 1V12 Mashina-S artillery command system. Built on the MT-LBu tracked chassis, it carries observation, navigation, rangefinding, communications, and fire-control equipment so a battery commander can reconnoiter targets, correct artillery fire, and coordinate with supported maneuver units from a protected forward position. Russian and Ukrainian 1V14 vehicles are documented in the 2014 Russia-Ukraine War through visually confirmed loss and capture records.
1V15 command and forward observer vehicle, Artillery battalion command and forward observer vehicle, Support EquipmentSupport Equipment1V15 command and forward observer vehicleArtillery battalion command and forward observer vehicleThe 1V15 is the battalion commander's mobile command-observation vehicle in the Soviet 1V12 Mashina-S artillery fire-control family. Built on the MT-LBu tracked chassis, it combines observation, rangefinding, navigation, communications, and fire-control equipment so an artillery battalion commander can reconnoiter targets, coordinate with supported maneuver units, and direct battalion fire from a protected forward post. Russian and Ukrainian 1V15-family vehicles are documented in the 2014 Russia-Ukraine War through visually confirmed loss and capture records.

Sources

List of BMP-1 variantsPublisher: Wikipedia | Note: Starting reference for PRP-4 and PRP-4M designation logic, BMP-1 family placement, variant equipment, and source leads. | Accessed: 2026-07-01Soviet GRAU Index ArchivePublisher: Archive.today mirror of Russian GRAU index list | Note: Supports the 1V121 PRP-4 Nard, 1V145 PRP-4M Deyteriy, and 1V166 PRP-4A Argus designation mapping; used cautiously as an archived index reference. | Accessed: 2026-07-01Army Recognition PRP-4A ArgusPublisher: Army Recognition | Note: Supports PRP-4A Argus specifications, BMP-1 base vehicle, Rubtsovsk design lineage, Russian district service context, and replacement relationship to PRP-4 Nard. | Accessed: 2026-07-01GlobalSecurity Rubtsovsk PlantPublisher: GlobalSecurity.org | Note: Supports Rubtsovsk Machine-Building Plant tracked-vehicle background, BMP-1 cooperation, PRP-3 production, and PRP modernization article sequence from 1984 to 1999. | Accessed: 2026-07-01Armforc PRP-4 Nard and PRP-4M DeyteriyPublisher: Armforc.su | Note: Detailed Russian-language reference supporting PRP-4/PRP-4M designation logic, development chronology, Rubtsovsk serial production, PRP-4MU radar distinction, equipment fit, and PRP-4/4M/4MU comparison specifications. | Accessed: 2026-07-02Voprosy Oboronnoy Tekhniki Fire-Control VehiclesPublisher: Voprosy Oboronnoy Tekhniki | Note: 2022 technical journal article comparing artillery fire-control command and reconnaissance vehicles; supports 1V145 Deyteriy and 1V166 Argus designations, PRP organizational role, and PRP-4M/PRP-4A technical comparison data. | Accessed: 2026-07-02VPK TSAMTO PRP-4A DemonstrationPublisher: VPK.name / TSAMTO | Note: Supports PRP-4A Argus Central Military District demonstration context, target-search role, thermal imaging and optoelectronic fit, and artillery targeting support. | Accessed: 2026-07-01UINP Popasna PRP-4 Nard AccountPublisher: Ukrainian Institute of National Memory | Note: Supports direct 2014 Russia-Ukraine War use of a Ukrainian PRP-4 Nard crew during the July 2014 Popasna fighting. | Accessed: 2026-07-02Oryx Russian Equipment LossesPublisher: Oryx | Note: Supports direct 2014 Russia-Ukraine War documentation of Russian 1V125/145 PRP-4(M) Nard/Deyteriy artillery reconnaissance vehicle losses during the full-scale invasion. | Accessed: 2026-07-01UNITED24 Myrnohrad PRP-4 LossesPublisher: UNITED24 Media | Note: Supports direct 2014 Russia-Ukraine War documentation of two Russian PRP-4 reconnaissance vehicles destroyed near Myrnohrad after a 503rd Separate Marine Battalion video. | Accessed: 2026-07-01WarSpotting PRP-4M 40578Publisher: WarSpotting | Note: Supports direct 2014 Russia-Ukraine War documentation of a destroyed Russian 1V125/145 PRP-4(M) Nard/Deyteriy artillery reconnaissance vehicle at Razine on 5 November 2025. | Accessed: 2026-07-02WarSpotting PRP-4M 40579Publisher: WarSpotting | Note: Supports direct 2014 Russia-Ukraine War documentation of a second destroyed Russian 1V125/145 PRP-4(M) Nard/Deyteriy artillery reconnaissance vehicle at Razine on 5 November 2025. | Accessed: 2026-07-02WarSpotting PRP-4M 43094Publisher: WarSpotting | Note: Supports direct 2014 Russia-Ukraine War documentation of a destroyed Russian 1V125/145 PRP-4(M) Nard/Deyteriy artillery reconnaissance vehicle on 25 February 2026. | Accessed: 2026-07-01Wikimedia Commons PRP-4A Argus 514Publisher: Wikimedia Commons | Note: Supports PRP-4A Argus gallery image provenance and CC BY-SA 4.0 licensing by Vitaly V. Kuzmin with VRT confirmation. | Accessed: 2026-07-02Wikimedia Commons PRP-4M 1Publisher: Wikimedia Commons | Note: Supports the primary PRP-4M image provenance and CC BY-SA 4.0 licensing by Vitaly V. Kuzmin with VRT confirmation. | Accessed: 2026-07-01Wikimedia Commons PRP-4M 2Publisher: Wikimedia Commons | Note: Supports additional PRP-4M gallery image provenance and CC BY-SA 4.0 licensing. | Accessed: 2026-07-01Wikimedia Commons PRP-4M 3Publisher: Wikimedia Commons | Note: Supports additional PRP-4M gallery image provenance and CC BY-SA 4.0 licensing. | Accessed: 2026-07-01